A remix proves an old song can sound brand new with a different beat under it. So can an old routine.

Changing what sits underneath can revive something that felt finished. A familiar song with a different beat under it becomes new, and the melody did not have to change at all. Routines work the same way, which is useful when you are bored rather than genuinely done. Different time, different place, different person alongside you, same activity. Often the thing was fine and the arrangement had gone stale.

Take something you have lost interest in and change one layer this week. Run a new route, study somewhere else, bring a friend to the thing you usually do alone.