I'm not sure there's a lot of difference between what makes autistics happy and what makes neurotypicals happy. Certainly I don't see anything unusual in what I would like.
These aren't in order of priority:
1. Financial security, though it's hard to set a particular figure on it, because life is unpredictable.
2. Fascinating things to do and experience.
3. Goals to strive for. They don't have to be big ones.
4. Bodily health.
5. A good, close relationship.
6. Several good friends.
7. Enjoyable food.
8. Reasonable freedom.
9. A degree of responsibility and duty.
To some extent I've got these things, which probably explains why I'm fairly happy. Not deleriously happy, but rarely in low spirits.