Advice climbing out of Silver 2
I've been to Silver 2 multiple times, and peaked around 90LP. After a certain point, I just fall back down into Silver 3 and have to re-climb back out.
I don't know what else I can do, or try. I mainly use

I have tried other roles as well, but cannot seem to carry as much. I usually end up doing something that costs the game, or there comes a point in the late game where it is harder to get a kill.
I would like some advice from higher ELO support mains on what they do that keeps them climbing. I know it is also a team effort, and not only on the support. That being said, I do try to build around the team based on champ select, as well as into the enemy team.
*Disclaimer, I have already been told "you can't carry as support, and to find another role". I don't believe that to be true.
Thanks,