Decorate your mind like your favorite room. Put up the good memories, clear the junk and let some light in.

What occupies your attention accumulates the way objects accumulate in a room, mostly without decisions being made. Old grievances, a running commentary you never chose, memories that only get replayed when you are tired. A fair amount of it stayed simply because nothing ever moved it out.

Choose one thing to put in and one to stop rehearsing. Bring back a memory you like and actually think about it rather than letting it sit unused. Small and specific works better here than any attempt to reorganise everything at once.