This is actually a legitimate struggle. Its difficult to climb solo if you arent a DPS main. I was stuck in silver until i said fuck everyone else and started instalocking DPS. Now im comfortably sitting in diamond
I'm a pretty good high gold/low plat support/tank, but I can comfortably say I belong in gold playing DPS. Just gotta keep playing the win some lose some game! Takes time, but you just gotta put the effort in