One thing that works is finding ways to make achieving small tasks part of your routine. I have a to-do list and in my lunch break at work I often pick off one or two things and decide okay, that's what I'll do when I get home. And so that way the selecting of the tasks and the doing of the tasks are things that have their own specific times and the decision is already made.

What also works is to create some external motivation.

I might not feel like cleaning the house, for example, but if I have friends coming over then I'll enthusiastically clean everything because I want it to be nice for them.

And so sometimes I intentionally weaponise that by inviting a friend over just to give myself that extrinsic motivation.