BB/100 is one element;
bankroll is more important.
Then there's whether or not you have enough
hands at the level for your BB/100 to be reliable. And various other considerations, but if your win rate is decent, you have the bankroll, and you've played enough hands for the win rate to be representative, then I'd say there's no reason to take a shot.
On the other hand, there's no reason to force it either, if you're lacking confidence or have leaks that you already know of.
Just don't get stuck believing that you shouldn't or can't step back again.