Eat more slowly and take smaller bites of your food.
Small bite of delicious food is equally as pleasurable as a big bite. Eating delicious food for longer and savouring its taste increases your pleasure from it. As a bonus, if you are trying to lose weight or eat less of something, you will end up eating less (you get full sooner) and digest better, too. It is trivial thing, but adds up to quite a bit of extra happiness over a lifetime.
Diligently followup on and solve (or minimize the impact of) health conditions and illnesses
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Being able to have routines and habits in the first place.
Work for 90 minutes then take a 15-minute break: https://www.powerofpositivity.com/researchers-explain-take-work-breaks-every-90-minutes/ .
I'm thinking especially of things that will be useful for the rest of your life, and apply to almost everyone. Things with huge ROI.
More obvious things:
Less obvious things:
I'm struggling to come up with many more things though. It seems to me there should be dozens and dozens of more or less obvious things. Learning to think clearly? (How specifically?) Communication skills? (Which ones?) Emotional resilience techniques?
Help me brainstorm here, smart people.