Don't try to simplify everything
Maybe that one thing that's bothering you and disrupting your peace and which you can’t accept or understand, is something that is complex that you mistakenly keep trying to simplify in your head. You keep trying but failing to simplify it and that makes you frustrated.
Maybe it doesn’t fit into any typical box or cookie-cutter. Maybe it can't be simplified because there are multiple aspects that make it what it is. Maybe it can’t be simplified because everything that seems similar isn’t actually the same. Maybe you're comparing it to something else so similar but its not the same but you think it is and expect it to look and behave the same way.
Not everything in life is simple or is meant to be simple. Let it be. Accept it for what it is. Stop trying to strip out all the things that make it what it is. Accept that not everything needs to fit into your brain’s cookie-cutter molds. Accept that not everything that looks and feels like they could be the same is actually the same.