it has already been mentioned, but if you are beating 25nl for a decent winrate and you're hardly even stealing blinds, you could be beating it for a shitton more. and being comfortable playing weaker ranges aggressively in position is something i'd definitely want to be comfortable doing, to an extent, before playing 50nl. if you've never checked them out, i'd advise searching for spoon's threads on blind stealing, raising behind limpers etc etc. i imagine they're in the digest. good luck!