I'm in my promos for silver now, fairly quickly compared to my last year.
My problem is, I'm supp/mid main (I love supp mostly) and it has been hard for me to climb as a support. It's hard to carry, and I'm pretty dependent on how my adc/top are doing. I'm not plat or anything, but my supp play is around high silver/low gold, and mid around mid silver (or so I've been told by plat/diamond players).
Last year I noticed my support skills are much more useful in silver. I had a hard time climbing out of bronze, but I got from s5 to s3 really quickly (less then a month) and complitely solo (and then the season ended).