To me this sounds like the preparation you do during the week maybe is a bit tiring or boring or both, so that even if you like the food you cook, the process is a chore. I’d include grocery shopping in “the process”.
If true, then you are amazing to keep on top of everything during the week, but it may provide some clues for arranging your weekend food into something you’re happier with.
Maybe you need simpler, faster recipes for the weekdays so you’re less fed up with cooking by the weekend? Maybe you need things which are more fun to cook, or which have more pleasurable sensory aspects, both in the preparation and in the eating? Maybe you could make some extra food during the week, that you can reheat or just turf onto a plate at the weekends?
Is it possible you are too strict during the week? Or that you’re not really getting enough calories over the week? What happens if you are more relaxed about how healthy your weekday meals are? What happens if you have small amounts of junky stuff during the week?