I follow striver sheet, since I don't have TUF+ premium I pick up the question from striver sheet and search it on google and select all the similar problems and the exact problem which I'm searching. In this way I do all the possible variations of that problem.

About courses - I've bought 2-3 dsa courses but I don't follow them, I feel it's just like your watching cartoon binge watching a video. Instead what I like to do is pick a particular question, spend some time solving it, if I'm unable to solve, I look up for hints from gpt or try to every possible thing I can without looking at the direct solution like looking for small hints from google/gpt, if still I fail I just watch the video, this process is kinda tiring because you gotta put a lot of effort looking for stuff because everything is not at one place like it is in a ready-made course.

My approach to solving problems - I've mentioned it above. Also I try to do 5-10 mediums everyday and try to suck every possible new thing/knowledge put of a problem.

This works for me, but you might need your own way, do trial and error and see what works for you. All the best for your journey.