I say embrace the chaos.

At any time I have 2-3 different skills or hobbies I rotate between, having those things chosen in advance but with enough variety to not get stale allows you to channel you focus when it wants to shift.

In my experience this also lets me pick up each of the skills faster overall than had I tried to soldier through and finish one before moving on, it lets you actually keep that mental momentum rather than having it go haywire trying to find something shiny and new.