For me it's been helpful to understand who benefits from my actions in that particular moment, and then prioritized the ones where I benefit too.
In personal finance context they say to pay yourself first. I think this also applies when e.g. prioritizing health. And when paying yourself first, this also means doing things when most energy is available and leaving other things for when you're tired.
Other things could be a _higher_ priority than a new thing. Just to give you an example (for huge amount of people priority to earn money to be able to have food on the table trumps almost everything else).
I answered below. I chose sport activity, because it's so simple and clearly benefits everybody and still only 30% of adults do it.
If you go to more complex things and on the opposite side of scales put a lot of complex and tangled priorities, it becomes very unclear what benefits most and how to pay yourself first.