LOW STAKES GRINDER TRYING TO GROW - HELP ME OUT!

Hi everybody,

My name is Elafipoker and I'm trying to grind out of the low stakes to make it a fulltime job as a poker player!
But it's hard and it takes a lot of time that is clear. Anyway you can find me building it up on YouTube as well: https://www.youtube.com/@Elafipoker

My question to you guys is; what is the best or are the best sites to actually study? And how do you learn difficult spots for free?
I'm using GTO Wizard but only the free version so I can't really put all the correct sizes and/or stack sizes etc. Do we really have to pay for something to really grow and become better?

Regards,
Elafi