Edited from an original post by /u/iosPixel
Welcome to the Burnt Out on GTAO players guide.
Do you own everything you ever wanted?
Tired of booting GTA Online up only to find you have nothing to do?
If like an ever increasing portion of the player base, you've filled your garages with cars you never drive, played every contact mission into the dirt, bored of pissing of the side of your yacht and finding your never ending Pegasus list is a mini game in itself then this guide is for you!
Once you've done everything obvious that the game has to offer, what do you do next?
Daily Objectives
Now everyone knows the monetary bonuses associated with dailies, but if you're dancing around in the end game of GTA waiting on the next DLC check your dailies out. If you're lucky enough to find participants, you may actually find yourself doing things you wouldn't usually do - and enjoying them. You can even challenge yourself to figure out what your dailies are by doing them without checking your interaction tab first.
Progress Tab
GTAO has a very little known about progress tab listed within the pause menu. You're not a true resident of Los Santos until you have experienced all it has to offer. This list is a great place to start. Not filled a Titan with players yet? How about watched a wanted player on TV? This section of the game tracks a lot of miscellaneous stuff available to you. The completionist in you won't be able to walk away now knowing this list exists. Head over to Start - Online - Stats/Progress
Awards Tab
GTAO has an award section that actually awards you! That's right. Free shit! Depending on what you complete listed here you could find yourself with free chrome rims or a selection of new tattoos, weapon skins and more! Who knows, they might bring back the old free roam events and allow newer players the chance to get some of the older tattoos. Might.
Head over to Start - Online - Stats
Aiding and Abetting
This is the term I use to describe one of my free roam personas. I seek out players being harassed and help them in the most entertaining ways. Combine calling a mugger with OTR to really piss someone off. Nothing beats watching some sap be pulled out of his tank by a mugger and you stealing it while he chases his pennies. Practice your sniping skills from a nearby tall building while they figure out why the heck you targeted them and not their own target when they aren't even killing you.
P.S Hail Hydra - If you've got skills you could become an "Angel Aviator" and target those that grief others in aircraft.
Griefers Charter
Now I know people won't appreciate this section, but seriously - there's a lot of fun to be had in GTAO if you play the asshole. I'm not talking blowing up crates, I'm talking about Hearses, Dubstas and an array of Simeon vehicles with ignition bombs strategically parked around the map, making good use of the empty personal vehicle to send players falling to their deaths, did I mention muggers? Park random buzzards and other choppers in the middle of the road with a proximity mine tossed underneath. Test your aim by lighting people on fire with your flair gun as they drive around on their Bati. If you have friends things can get real interesting. Insurgents make good jihad jeeps, send a player hurtling before impact by triggering that well placed sticky.
Become a Youtuber!
Sick of the shit rehashed content that's all over YouTube? Why not add to it. Browse the Reddit, find a subject already widely covered and cover it again. Don't forget to ask for subscribers and likes, bonus points for annoying long intro and outros. Alternatively...
Learn Rockstar Editor
Remake movies. Make new ones. Make music videos. Be creative.
Create-A-Mission
This ones simple. Take a contact mission and add a stipulation to it to increase the difficulty. Notable inclusions are Muskets and Pistols only. Until we get a mission creator, this is the best we've got.
Sunday Driver
Have you experienced all the music GTA has to offer, take a car and cruise round the highway taking in sounds and sights you may have missed. You don't have to stick to the roads and there's plenty of vistas to be had. Some sight seeing tips are in our Wiki
Roleplay
Roleplaying is one of my personal favorites to spend time in Los Santos. Be it Cop, Vigilante, Asshole or Chartered Pilot/Yachtsmen there's plenty of job roles to fill. I like to call Downtown Cab Co, jack the car and approach players in the hope they'll hop in and provide a destination. One caveat, you'll get more passengers not being in passive but you'll also end up with brains on the dashboard fairly often to. Advertise your services through the In game text messaging service or public voice chat. Other ideas include making yourself look elderly and pulling the Sunday Driver tip, making yourself into a mime or clown and using actions to interact with other players, putting on any of the paper bags and being a convenience store thief.
Be a Scientist
Wonder if you can do something, then test it. This is how a lot of the "secrets" are found. "I wonder if you can jack a Hydra mid air?" Yep! And kill the pilot in the process! "I wonder if you can hit a grenade with a baseball bat?" Use the grenade launcher or the timer is too short. "I wonder how far away I can hit things with the Valkyrie." Test it out...
Try Again
Start a new character. Change your gender, change your goals, own different cars and different apartments.
Notable Exclusions
CEO/VIP Work - It's new and might not seem so stale, although if you're here I doubt you need to be grinding crates. Stick to the missions and throw in some stipulations for longevity.
Criminal Mastermind/Heist Challenges - If you can source a team, this tedious award is worth it for bragging rights. Elite T-Shirts are seldom seen.
Stunt Jumps - Grab a guide/map and dedicate a couple hours to these, some great shots to be had.
Glitches - Some glitches are cool. Let's face it, check out /R/GTAGlitches for something other than money glitches. Occasionally a cool outfit or launch glitch pops up that can add fun. I recommend searching Supermans Playground for some fun with GTAs quirky physics.
PVP - You've avoided it this far - but why? Get involved, say goodbye to your KD if you haven't already and learn the mechanics of the game. Some are cheap but it's a whole aspect of the game that players have avoided for their entire careers. Maybe now it's time to jump in.
Crews/Communities - If you enjoy car meets or mindless fun there's probably a community out there for you. Thanks to /u/CyborgWarrior
Creator - The creator has a wealth of props available to you. With the addition of the stunt creator you could definitely lose a few hours here. Thanks to /u/Kenraali
Time Trials - Have you done them all? They're being recycled now. It's easy money if you are good at racing.