Those of you that recognize Epictetus 1, may have tried the exercise / method of analysis. Line down the centre of page, one side is the "up to me", the other side the "nots", as defined by Epi.
The simplest form of a decision is assent to a proposition, or rejection, or occasionally withholding judgement, after reducing the issue to an "adequate" proposition.
There is a lot I was, in the past, concerned with. No more. It is all somebody else's problems now.