End of Season 4

I'm not going to main support anymore. It doesn't matter how hard I try I can't carry. My team makes stupid decisions and pineapples me in the end.

i find support one of the easiest roles to carry with. But this is at high plat/low diamond where your team generally has a better idea of what to do.

I agree, support is one of the easiest roles to carry with, and I was Silver 3 - Silver 1 when I was active on ranked. As a support (and a jungler) you're in the best position to make confident decisions for your team since most of your job involves watching the map. Also if you win lane, you can snowball mid effectively if you get the opportunity to gank, or even just by warding wraiths/their bottom side buff camp. As long as you're vocal and you seem sure about your calls then your team will follow a lot of the time.