Try to mostly focus on rapid instead of blitz and bullet, because rapid allows you to focus on deep calculations. While blitz and bullet chess require you think quickly and most likely depend on a single blunder for you to win quickly. Idk if this is the best advice but just try focusing only on rapid chess. Hope this helps ya.
I Mean I will focus and learn from my mistakes but it’s kinda impressive a 100 knows this even tho it’s 1200-GM I play 10 min will start playing 15|10 for thinking.