Support in ranked

I need some advice! I am a support main its the only role I can play and the one I enjoy most! I am super stuck in Bronze 2 prob be bronze 3 soon and no mater how much I try I just cannot get a win : ( Which support is best for Bronze area? I like playing Soraka and Sona but I have been changing around a bit to try and get some wins I think I made it to silver 2 last season. I have been playing Blitz and Thresh they are a lot of fun but I think I need more practice, when I play normals I dont have half the problems I do in ranked! Is there a champion or two I should focus on to help me climb? Also due is not an option as all my friends are waaaay to high so I cannot duo with them! Thanks & yes I know its prob mostly my fault etc
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