Help, stuck in elo hell.

I've been in bronze for a LONG time, I play easy champions (Vi, Poppy, Garen, Nasus) But I also play medium to hard ones (Yasuo, khazix mainly) and I do good, my scores are perfectly fine along with CS too. In most of my games I will perform well and do good in my lane, my cs is mostly good (100 or near 100 cs in 15 mins) and role but my team mates just feed and lose objectives. For example 2 games ago I had a bard adc, and before that game I had a game where my bot lane and jungle gave the enemy adc a triple kill like before 5 mins. Their builds are completely CRAP too, they don't know when to build what or what items will you will have to build to counter what the enemy team is building. They don't know of any good team comps such as no tanks and all ad. In some games most of my team mates attack the tanks and the supports instead of the actual damage dealers. They ignore what I say and do whatever they want, there's no teamwork in this what so ever. But I've been duoing with a friend recently and won a lot of games, my winrate with vi is near 70 percent of 30 games. But he isn't always around so I go solo (even if he is around there are still shit team mates but we tend to carry those games) and encounter retarded team mates. Also, I just don't know how you solo carry games while the enemy adc or jungler is like 10-0, and in team fights all the dumbasses will target the tanks etc. instead of damage dealers and they will just 1 shot us because they're 10-0 15 mins in, they win team fights. Terrible decision making too, chase for like a minute till they die, bad positioning, bad ults etc. Especially trollers, once they do bad a lot of people will Int and this is so annoying as they become ignorant and start blaming the team for their mistakes. Once this happens, I become tilted and will start to feed and do bad decision making too. So please, if someone has a guide to getting out of bronze, please tell me or any tips will be appreciated. (also I do mute players sometimes). Thanks.