Hypomanic self-care is almost identical as dealing with side-effects of stimulants:
You really need to make sure to eat and rest and drink, even if these signals don't come through clearly. Neglect will fuck you up pretty fast.
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I used to be notoriously bad at this, and would have short periods of hypomania during summer that would lead straight into exhausted crash depressions lasting weeks.
The body can adjust a lot of its needs out of psychosomatic effects, but it still needs energy inputs.
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I find that when I eat and sleep well, or as well as I can manage - it's still a lot less than normal - my energy flows tend to be more stable.
This, rather than increasing manic intensity that eventually swandives into a depressive crash.