LFG Plat 5

Ive been trying to figure out what role I should main, currently I play (top 4 champs) Jungle : Lee Vi J4 Nid Fizz Mid: Kat Cass Zed Ahri Adc: Vayne Corki Kalista (I only play 3 adcs well)

Yea I don't really know what role I wanna play but I can play any of the 3. Im looking for a team that plays around 3 - 7est and is gold+ I mainly just wanna get better and im not to focused on the teams ranked.