Most of the time , High and Low of Day are set during the first 30 minutes, good for buying and selling (stocks hold overnight) . A trend reversal by 9:40 to 9:50 approx. is a big help too.
Nasdaq has reached the top of its downtrend line. Next week will be critical. If it breaks 1365, it will be the start of an uptrend and trigger the long position for QQQ. If it starts sliding to 1280, take a short position.
Good Luck