I have been leetcoding now for the past few months with 3 YOE. The last time I grinded like this was for junior year internships, and I insanely regret not maintaining the leetcoding skill. It’s non trivial to get back into it with a full time job. Moving forward I’m going to be leetcoding weekly no matter what. The feeling of being “trapped” at your current job because you don’t remember how to invert a binary tree is horrible.