It's not really a one-or-the-other kinda deal. It's not a fork in the road. Acceptance of things you cannot change isn't an opt-out whilst it is possible to opt out of trying to change things that you could change if you tried. But accepting things out of your control IS a change in itself.

Make an effort to discard the anger, bitterness, and confusion that results from "things you cannot change" and you'll probably find it easier to focus on the things you can change.

Whether it's interesting or not doesn't (shouldn't) really factor into improving one's long-term mental health.