Look at your past games. Examine your blunders. Figure out what your mistakes were; did you hang a piece? did you step into a fork? Did you miss their checkmate in 1?
And now for the hard part. Don't do those things. Why did you hang a piece, why did you step into a fork? Why did you not see their mate in 1?
The last part is hard. Everyone around our rating struggles with this.
Now for the second part. Your rapid rating here is about 850. This is your chess.com rating, it bears no relation to you USCF rating, except your USCF rating will be lower. In my very limited experience, a chess.com 850 will likely be beaten by a USCF 1,000.
Hang in there, you've got this!
I just got Masterclass with Garry Kasparov and I've been watching the videos from Remote Chess Academy with GM Igor Smirnov, trying to improve my game. But I went to a tournament over the weekend playing against other opponents less than 1,000 rating in USCF, and I lost 3/4 games. I feel so hopeless with chess. I keep making blunders no matter how much I study I'll never be good at this game.