I'll list just a few:
- level to 70 other jobs to see how they are and maybe find one you have more fun with, who knows;
- all the crafting stuff still a world to discover;
- all gold saucer games and minigames and vermilion and chocobo races and triple triad;
- all the extreme primals can be learnt without a static;
- I'm sure I missed still a lot more...

Last but not least, you still can create your party finder with "learning" tag for the raid you'd like put your nose in. Surely some kid that still haven't completely learnt how to read will butt in and rage at first wipe, but I'm sure there is a lot of people in your situation and will gladly join such party.