If you have nothing to fix you obviously don't need a productivity hack. It's called being done and you should either retire or move on to something else.

I celebrate. I've accomplished my goal.

Habits have context. I do gardening and I have a habit of checking my garden beds for weeds and diseases every day. I don't do it in winter when it's freezing and nothing is growing. I'll pick it up again in spring.

You don't have to game the system you've created. The habits are for you, not the other way around.