Read articles about tight and loose players. If you have a tight-aggressive strategy, then you are doing everything right, the main thing is to stay calm. If you play loose, then the main reason for down swing is your playing style, and then you need to change your playing style in order to start winning. It is easy to determine, look at the range of starting hands of a tight player and the range of starting hands of a loose player, and you will understand what class of player you are. Of course, good starting hands should definitely be played with a raise before the flop, so as not to launch opponents into the game, for example, on 2 3, 6 8, J 7 and other similar hands. Motivate yourself that you are doing everything right and the reason is not in you, and once the down swing will end and you will start winning again.