Life is a series of boxes. Be it Scrum or Marie-Kondo-ing or dieting or GTD or cleaning your house.
If you feel you're not in relaxed control of your life, produce a handful (and not more) "boxes" (metaphorical or real) that have sufficiently sharply defined edges, and sort your things into them. If the boxes become large, subdivide, but keep the edges sharp.
Revisit your boxes on regular intervals.
That way you don't have to think about things that you don't need to think about right now and have enough space to tend to the things which don't yet or maybe don't at all fit in boxes.
You're welcome, I would like to have my book-deal now.