Getting out of ranked ..until..you decide.

I'm currently Bronze II, I don't think my play in general has been too aweful, but it's clear to me that I am not going to carry myself out of my current league to bronze 1 playing as a main support with the skill I currently have. I enjoy solo/duo because I do like to play seriously when I play. But I jumped in way too soon. I know what the meta is, and until I get those champions in all roles I'm gonna bow out.

What is a good range of matches played/champions owned to go back into ranked? My flist said anywhere between 5-600 wins with 2-3 champions per role mastered. Which sounds about fair. I just really like ranked its hard to break that habit even if my win/loss hasn't been favorable.