i fell like i don´t improve

I’ve been studying how to draw heads for a couple of weeks, but whenever I take a break for a while (like a day or two) and go back to drawing them (even from simple angles), it feels like I’ve completely forgotten how. I’m really unhappy with the results I get in those moments. I’d like to know if there’s a way to improve this; while it happens mostly with heads, it affects other areas too, and it’s really demotivating.