A sourdough starter goes sluggish when you only feed it when you remember. So does anything you care about.

Living things need regular attention rather than remembered attention. A starter fed only when it crosses your mind goes sluggish, because the pattern matters more than the amount, and friendships, fitness and any skill you care about behave the same way. Occasional bursts cannot make up for absence. Something kept going on an irregular schedule is slowly declining even while it looks fine.

Choose one thing you have been feeding only when you remember and give it a fixed day. Sunday call, Tuesday practice, Thursday walk. Regular and small beats enthusiastic and rare nearly every time.