I use a habit stacking app, Routinery, where I can break down a habit into as many small pieces and put a time stamp on them, but you don’t have to— writing out the whole process for a task really helps me. So if I’m making lunch, the steps are: get ingredients out of fridge, slice bread, get a plate, assemble lunch, get a glass of water (include this in every task, it good for you), sit at the table, eat, take plate to dishwasher, close/clean ingredients and put away in fridge, wipe down counter.
This way, if I get exhausted halfway through, I know how many steps are left to do, and if they’re small, it’s easier to see that I’m almost finished.