doing something regularly keeps you sharp, and keeps the thing fresh in your mind so you’re thinking about what you wanna do / do differently the next time you’re practicing, and the easiest way to do that is to reduce friction however possible
what’s worked for me in the past is (1) paid classes; the structure, communal environment, and losing money / losing face kept me going, which in turn kept me motivated and excited, and (2) routine collaboration; when i was fresh out of a paid class for DJing i talked to one of my friends who was interested in learning, and we agreed to meet every saturday morning by default to practice b2b unless we had a previous obligation, which kept us both excited, looking for new tracks, and freed us from the guilt of “when was the last time i practiced? when is the next time i’m gonna practice? should I even keep trying?”
if it stays easy and fun, you’ll keep doing it, so you’ll stay motivated; it’s just about figuring out what you need to keep it easy and fun :)