There is a lot of good advice here, I wanted to add one thing to it. You might want to take a break from blitz, it causes a lot of bad habits. Try rapid for a while, (idk a month? I was told this by a lot of good players), it helps me anyways.
why must you do this
or try out a new strategy that could help, and take advice from other players. It helped me soooo much. In fact I used to use the same strategy every time I played.