Decent Tank, Can't Get Out of Bronze, Almost Centurion Prof With Groot. What Can I Do?

I feel that I am pretty decent with Groot. Won't say I am great, I could be trash but can't get out of Bronze rank. Nobody wants to play tank, heals are not always the greatest, sometimes they are good but can't figure out how to get out of Bronze and it's driving me insane. Any tips on how to better rank up or inspire synergy with the team? When I call out enemy positions, or weak enemies, or communicate that I am getting on point it seems like nobody cares and wants to do their own thing. Any advice or anyone wanna link up and play lol?