How to make DS/Algo Prep fun?

I have always wanted to prepare DS/Algo like a pro, but have barely survived with my basic skills of that. How can I do it the right professional way, in a way that makes SDE interviews for Google level easy. I have a problem of not being disciplined to grind Leetcode. Should I join these coaching classes like Coding Ninja, Scaler and guilt my self into discipline because of money? Any books? I know concepts, I just want structure in my prep.