you aren't doing well at 50nl due to lack of correctly applied aggression which is rooted from the problem of poor hand reading.

looks like you do absolutely nothing to defend your blinds besides 3bet the nuts and are bleeding money from them. you aren't exploiting players who open wide ranges in later positions and are just giving up to them.

having negative sd winnings isn't a bad thing but having them drop this sharply is.

good news is this can all be fixed.