I've been playing mtts online for the past year and want to improve my game.ROI wise over 500+ games I am at -19%. Although it could be better if I were running closer to EV, I still don't think it would bring it into the positive. I feel lost as to where to look at for leaks.

I'm posting my stats below and would really appreciate any pointers.

Edit: Link to the stats full size: https://ibb.co/gXMfhn