Suggestions on YouTubers for learning surf at a higher skill level?

I've passed all t1 maps finally, about to start working on all T2 maps, passed most of them but still got quite a bit to go still. I should be able to start T3 soon.

Any suggestions on advice? I've gotten to the end on a couple of maps on T3 with saveloc but I still don't think I'm ready to beat T3 without saveloc. I think I need to go over more fundamentals before continuing.