What should i have done?

Tldr: Team wouldnt listen that enemies had better team comp and kept teamfighting.

This isn't a rant post or a "my team is trash and im the best" kind of post. It's just a question of what i could have done to win that game.

So my last game the enemy team had a great team comp and very snowballing champions at the same time. Usually the way to counter a great team comp is by splitpushing and by warding and dewarding to catch some of them out. I told my team that and we had a master yi jungle with tp (no f) which i thought would also be good for the splitpushing.

I was the supp and was plannign to get zzrot and banners to help as well but my team thought it would be better if we teamfight. I tried communicating with my team telling them that if anybody gets fed (which they most likely will if we teamfight since they have so much syngergy) they can carry. But my team wouldnt listen to me. They refused to reply back and to communicate.

Being the support i couldnt really be the splitpusher and i still didnt buy the items i was talking about since i was still building my second tanky item since i was the only tank (was gonna rush it aftewards)

I kept jungle warded and dewarded and tried to make sure nobody gets caught out with pings and everything, i tried to get objectives and not teamfight. Don't get me wrong, im sure i made a lot of mistakes as well but im just wondering how i should have forced my team to either carry out my plan or come up with a different one that's better than what we were doing. But they seemed to refuse to want anything other than fight.

Should i just have built zzrot and banner and some attack speed and split push myself? But then whenever they teamfought i wouldnt have been able to save them as much as i did. I really dont know what i should have done to make them communicate their ideas and thoughts to the team.