The right environment can make good choices require less effort.

Willpower is expensive and environment is cheap. If the fruit is visible and the biscuits are in the back of a cupboard, you will eat differently without ever deciding to. If the guitar is on a stand instead of in a case, you will play. The setting quietly decides most of what you do.

Pick one thing you want more of and shorten the distance to it. Then pick one you want less of and add a step. That is usually enough, and it works on days when your resolve is gone.