I Want To Be A Better Support But I Don't Know How
I have just gotten back into playing LoL after a long hiatus. I started playing about a year and a half ago but only played for a couple weeks and would stop playing for months only to come back for a couple weeks. This time I am here to stay due to the lack of fun games to play. While playing LoL I have taken a liking to the support role. My favorite and pretty much only support champion I play is Thresh since his kit is amazing. The problem that I am is that sometimes I play games were I dominate in lane and play like a pro. I even get called Mini Madlife and people think I'm in Plat 5 when I am really unranked. But other times I even up going 0/7/9 and we lose the match. I don't know if this is due to the enemy bot laners or that my ADC isn't good. I have noticed that I lose the majority of my matches where my ADC is a late game champ such as Twitch. I don't know if I'm good at the game but get paired up with bad teammates, or when I do well its because my teammates carry me.
Can anyone give me tips to figure out what is causing my loses and wins? I want to get better at LoL and eventually play in ranked matches but I don't know what is holding me back. If it helps this is my LoL King profile
or 
or 
(Note: This also heals you)