first thing, dont worry about other people mistakes, its only going get worse from there and you going be worrying about other peoples mistakes in other games and the negativity just going to keep going. Just improve what you could've done, like if you see your mid lane keeping dying and has like 3 deaths from now, dont be afraid to speak up and say hey!, your a yasuo or whatever champion (you'll need to know some knowledge on the champ) like example ,
hey man your
, you died three times your not going to win alright, sooooo q farm safe farm, or if you push to much then roam. and 2 things will happen, 1 they will listen or 2 they give you the fuck you and they get stuck in there elo until they fix there attitude.
learn to like command like, if your bot and you destroyed the bot lane, go for the objectives while u have your lead, so if mid gets sht on, tell them go bot go farm while we pressure mid, most likely the bot wil either stay bot or head mid and have a 3 v 2 whiile your mid catches up, or it will be a 1 v 2 bot lane but your mid has some levels on those mofos.
and its not bad to be in bronze , just think how to improve and what you could've done to change that game and apply that change into the next. not all games your gonna win trust me man. but sometimes it does help you duo people around your area if you do really trust them and then when you get out of that bracket and there still stuck, 2 options help him or toss away and keep climbing, is that a douche move. yeaaahh, but hey there are reasons holding him back and more that likely they will say, its my team man.
but best in luck with your games man.