QQQ is trying to re-test the previous breakout level
Last breakout level, May 14 high, is 327.33. Today's low is 328.28. For the past breakouts in May 2021, September 2020 and March 2020, 2 out 3 have the gap closed. Anyway, after re-test previous breakout level, when there is a strong bull signal, bulls will buy above it.