The first priority is to accept that things are not in our control. Don’t ever make the mistake to think that you can actually influence outcomes. Just concentrate on the process, and let the chips fall where they may.
The second priority is to embrace change. Nothing will ever stay the same, nor should it. The past is seen through rose-tinted glasses because closer times invite jealousy, while distant memories bring admiration.
So don’t wish for things to be as they were, or to be different.
You should want things to happen exactly as they happen.