Tips for Climbing?

My first time doing ranked was at the very end of the season and I was placed Silver 2.

Last season I was placed Silver 5 and climbed pretty quickly back up to Silver 2, where I remained until the end.

I got placed Silver 5 again this season and I'm finding it VERY hard to climb back up to Silver 2 again...this was the first season I was actually demoted.

I got up to Silver 4, and then was on a big losing streak (and to make it worse, one of the games we lost was because our jungler was afk and never left spawn and we weren't allowed to remake) and now I'm back in Silver 5.

I main support, but in Silver I find that people kinda do what they WANT instead of what they SHOULD do.

Like, I try to pick supports that go well with not only my adc but other champs on my team, but I find that nobody tries to pick champs to make good teamcomps and nobody picks champs based on what the team needs. Like AP/AD, tankage, etc. I can go tank supports if needed but it's not my strong point..I main Nami and Sona.

I'm not sure if I should start adc'ing more so I can try to carry, if that would be better? Or should I stick to support? Or is there anything else I can do to try and climb?

Any tips are appreciated..I know I can get back to Silver 2 but for some reason this year it's a lot harder than usual..