U can't win more if u don't play your main champion

I was having some trouble getting out of gold 4 when i decided , that why not play my main champion over and over again . I personally don't enjoy playing the same champion for many games , wich is the reason i couldn't climb . after playing only my main champion i was able to go from gold 4 to gold 2 within 1 week , after that i started playing not only one but 4 champs at the same time , this caused me to lose more games and started demoting . reminder : don't play ranked with champs u kinda understand or kinda know how to play , always pick the champ u know best , because not fully knowing what your champion does can cause making eaven the smallest mistakes wich can cause u losing the game .