OK, I looked at your Bullet games. I can instantly make you a better Chess player. 1st off: Stop resigning so mush. 2nd off: Stop resigning so much. 3rd Off: Stop resigning so much.
In bullet all you need is a single pawn on the board. If your opponent times out, you win the game. I suspect that you lose one or two pieces and then give up.
Make your opponent checkmate you, even if there is no way of checkmating your opponent. Look at your wins. Have you noticed that less than 10 percent of your opponents are resigning?
Here's another thing. There's an opening called the Hippo. It will save you a tremendous amount of time on the board. The first 10 moves are pretty straight forward, and the great thing is the move order doesn't matter. You can also use the Hippo for white or black. It will save you time, and at your level, time is the name of the game.
I'd say get better at blitz and rapid before playing bullet
Somehow I got to 1600 that way:/