I had a look at your most recent loss and have anotated some feedback beside the moves:
In short, you missed an opportunity to capture a free piece, and then moved your queen onto a square that could be captured. There are some general questions you should ask yourself before each move that will help at the 350-550 level, such as:
1) Can I capture any of my opponents pieces?
2) Can my opponent capture any of my pieces?
3) Before I move my piece to this square, is this square attacked by any of my opponents pieces.
I'd recommend reading up on "Opening Principles" to start with, there are articles on the subject here on chess.com. I'd also recommend the 'Puzzles' feature for practicing this concept of finding good moves, looking for checks, captures and threats to find the solution.
In the rare event you are playing someone you suspect of cheating, you can report them and the chess.com fairplay team will review further.
I'm stuck there, I could beat ~1400 bots very easily but playing with them is insane. I guess they're cheating by copying my moves to a maximum bot (3200 Elo). Ok maybe because I'm too noob, but I don't think so because most of them have ~80 accuracies! what I have to do.