I'm going to just briefly throw in my 2 cents here: The previous commentators are correct that it's not your teammates' fault you're stuck in Bronze. What I will say is that it is possible to hit these unlucky streaks where the players you end up paired with certainly make it more difficult to climb, sometimes exhaustively so, but your teammates are not what's keeping you in Bronze.
Believe me I've been there, as have some of those posting here. I started playing in Season 3 and did my placements towards the tail end of it. I got Bronze 3. I thought that was pretty good and that I would climb because I thought I was decent at the game. Little did I know how much I didn't know at the time. I dropped down to Bronze 5 by preseason. I would remain between Bronze 5 and Bronze 4 for multiple seasons to come right up until the beginning of this season.
You want to know what's even worse? I'm legally blind IRL and partially deaf. Try adding those to the mix of stresses and hindrances to getting good at League. But I enjoy this game and I know I'm a pretty intelligent person, but I had to realize I would not leave Bronze elo unless I learned how to play better.
I sympathize with Bronze players caught up in the stress and frustrations because most high elo players would just tell me "get gud and shut up". They were arrogant pricks and who offered nothing helpful to me. They told me to swim, but refused to teach me how. So let me tell you as I would hope someone else would have done for me. There are resources out there and content creators who aren't jackasses who do want to see players succeed at the game and climb ranked to the peak of their capability. YouTube channels like Leaguecraft 101, NEACE, LS, and similar personalities are fantastic sources of instruction. I wish more NA players would treat low elo players the way NEACE and LS do in their coaching. Tell them bluntly what they need to hear, that they're bad, they're trash, they keep making all of these mistakes, BUT also inform them that they CAN improve and help them to see just how they could change how they play.
Sincerely, a hardstuck handicapped multiple season Bronze player who put the effort in, played hundreds of games, watched hours of videos, and climbed his way this season out of Bronze and into Silver 3, on his way maybe to even Silver 2 by season's end.