Bro, play Tryndamere and Renekton ONLY. You have over a 55% win rate on both these champs for over 20 games. You're doing something right there. Stop playing all that random shit. Play ONLY your best EVERY SINGLE GAME!!
Don't believe me? Here:-
https://na.op.gg/summoner/userName=vbniya
I played all kinds of random shit in ranked on that account. It took 1000 games to get to Gold. And the only reason I even got to Gold on that account is because I stopped playing champs I was losing on and played only my mains.
https://lan.op.gg/summoner/userName=xelniya
I played ONLY my mains on this account and got to Gold in a little less than 300 games. That account started somewhere in low or mid Bronze.
https://na.op.gg/summoner/userName=icepacc
I'm currently ranking on this account, again playing ONLY Kayle, which is currently my best champion. It started in Bronze 3 and as of this post is Silver 3 with a 60% win rate at 70 games played.
Playing random shit that you can't maintain a high win rate on will fuck you very hard. I have zero doubt in my mind that if you one trick your Tryndamere and Renekton, you would easily climb out of Bronze. You might even be able to get Gold. Stop playing shit you're no good at.
If you're bored of one tricking, play Norms, Flex or ranked on another account where you don't care about climbing on. But when you're playing on your "climbing" account, play only your best.