For game no. 1, I'd recommend that you improvise on king safety.
For game no. 2, you're king is unstable and still you're going for making queens.
In game no. 3, you overlooked the blue bishop, lost your queen, panicked and helped blue's queen get a mate in 1.
Overall, your main issue, like many other 1600-1900 rated players, is king safety. I suggest that you try to try to completely block your flanks pawns so that they can't break your position.
I've been losing a few FFA games and I need help
Game 1: https://www.chess.com/variants/4-player-chess/game/27874120/214/3
Game 2: https://www.chess.com/variants/4-player-chess/game/27873445/157/3
Game 3: https://www.chess.com/variants/4-player-chess/game/27873221/96/3
I think its probably my strategies I'm using wrong.
Please help me and analyze.