my winrate at 600NL is -70BB/100 over 1k hands
At 1/2 and 2/4 its 4BB/100 over 100k hands

At 10NL I think I had 16BB/100 over 450k hands.

You need to play a lot more hands to have a good sample size. I haven't had a good sample size since 10NL to tell me because I've moved up in 100k hands or less at each level.

Win rate is meaningless, just play a bunch of hands at the level you are comfortable at and win money.