If you are a serious player, go find Jayser, it's gonna be one of your best investment
I was a NL200-500 player before I met Jayser, now I'm beating 1K comfortablely with playing 2k/3k as a mix after purchasing his 6 max theory course.
I thought I was a player paying a lot of attention to detail before I met Jay, then I realised how deeeeeeeeeeep you can go into detail
In short, Jayser is GOD TIER