Sooner or later, everyone looks for closure with some issue they’re struggling with. The unfortunate truth is you can’t ever just get closure. You can’t even give closure to someone else. That’s not how it works.
Honestly, if you want closure, you’re not ready for it. You’re still worried about that thing, and not quite ready to put it to bed.
One day in the future, you’ll think about that thing you wanted closure on, and you’ll realize you have it. You won’t know how, or why, but either you’ve somehow achieved closure, or you just don’t care anymore… which might as well be the same thing.
Or you die. That works too.