It seems like kind of bad advice to tell someone to play at a higher level based solely on BR. It should be based more on ability. If you are consistently beating your current level over a large enough sample, then move up if BR allows, which it should.

If you move up and find you are consistently getting outplayed, move back down, regain confidence and build up a larger roll to make your next shot to cover the expected losses while adjusting to the new level.

If you are unable to adjust (to low/mid stakes games), then your overall game will probably need some work, so move back down to work on it. Why pay more while learning than you have to?