I just finished all exhibition races and championships. What now?
Congrats! I suppose that’s an easy task when you have the game set to less than expert drivatars, but good job nonetheless !
beating the game even on unbeatable isn’t that hard. Every now and then on unbeatable you get the runaway drivatar but most of the time they aren’t even difficult just programmed to finish close to your time in the event that the runaway glitch doesn’t occur.
Whatever you want. Build new cars, race new cars. race online, attack the rivals boards, race you own custom blueprint championships, do zones, jumps, buckets etc.
Goliath Grinding…
Do you like driving? Do you like cars?
If yes, there should be plenty of answers.
Have you collected all the Horizon Edition cars yet? There are near 20 available now, and more on the way. Have you set good times on rivals events?
I spend most of my time doing online adventure and making liverys and the odd tune set ups but like everyone else said above there are lots of other things to do to, everyone likes different things and this game has it all 
Is the problem that you feel the game doesnt have enough content or do you want something to direct you?
If you have the Ultimate Edition, wait for the new car packs to be released and try them out when they are? Or play another game until then…
First of all. Ahoj & Congratulations.
It takes some good endurance to do it all, indepenant of the chosen difficulty (I’m still far off of that and it’s the last 25 Forza points to catch :D)
More stuff to do:
- play online
- get 100% completion (anything still open, got all achievements?)
- photograph all cars
- get all cars (wait for Black Friday)
- create badass or funny bucket challenges for your friends to beat
- do some aesthetic photography and participate in the weekly photo contests
- create some cool liveries and participate in the weekly livery contests
- do rival challenges
- check out promotion rival contests with nice real world rewards(there’s one by Amazon around The Grand Tour atm., sadly it’s only for US citizens).
I mostly just play multiplayer, race after race trying to win or at least finish in a non-last position. 
The other players are neat, sometimes they talk, I have pandora on in the background, and the challenge seems to scale as I improve. Plus the way the others drive is nothing like the AI, you get a ton of rewards, and it’s really addictive to play long series of multiplayer races. I want to get into upgrading and tuning too.