I wrist aim and use 0.42 @ 1200DPI. I can’t use my arm that well due to a physical disability. I really want to get good at this game but most people tend to use low sens, is using a higher sens futile?

So i was down bad, like i mean 10+ losses in a row, went down from immortal 2 to diamond 3, and then in my first game as a diamond 3, i lost. But for some reason, it ranked me all the way up to the top of immortal??? like 73 points or som...