so I'm a support main...
I started Maining support in season 4. I mostly played support and jungle because those were the hardest things to find in team builder and I hated the long waits. I was also intimidated by solo lanes. Farming, mechanics, direct one on one competition all made me uncomfortable.
As time went on I got better at support, expanded my champion pool and started playing ranked. I placed Silver 5 after my first ever placements (season 5) but quickly decayed to bronze 5 because frankly I wasn't good enough. So I stopped playing ranked and played exclusively normals and ARAM. I got very familiar with most of my champions and have a couple of go to Champs for each position.
I started plain ranked again this season but even though I regularly play against golds and silvers and even the occasional platinum in normals, I couldn't drag myself out of the bronze 5 abyss as a support. 1 step forward and two steps back constantly. The usual complaints; some lane feeds, my ADC too aggressive, no followup on my initiations and yes I have bad games too.
I've come to the realization that even if I'm flawless, you just can't carry your way out of bronze as a support. So I've been playing exclusively top and mid this weekend. And you know what? I jumped two divisions in like 12 games. I'm 75% win or better. Perhaps I'll play support again after I get to silver and see if things change...