Climbing out of Silver 1 (Just a rant)

I'm a silver player, been silver all last season, all this season. This season I played more than 1200 games but didn't budge an inch. I've lost 5 gold promos after going on a 10 game win streak, only to suddenly have it turn around and go into a 10 game losing streak. I have mains in every role. Top to Support, I have hundreds of games in each. All I am left with now is one question. Why? Why can't I climb? I have one of the lowest deaths on my team pretty consistently save for a few bad games here and there. I have the mechanical ability to have a diamond friend tell me that I could end up in Plat pretty easily. I just don't understand what I'm doing wrong. I have done everything possible, focus on vision, accounting for enemy locations, roaming when fed to spread advantages, I mean, it feels like I'm checking off all the boxes but yet I consistently have games where there's a five man dive bot that turns into first turret, dragon, rift herald, mid turret, and then the team falls apart. Or games where I go 5/2/5 on Evelyn but lose two inhibitors before 20 minutes. All I've wanted was to progress. I've adapted, changed play styles, from carries to tanks to supports and healers, but it just feels like there's nothing. Like no matter what, no matter how well I play for someone hard stuck silver, it's never going to happen. Gold and beyond is never for me. For other people it just seems so easy, almost like the dominoes just fall into place for them and as long as they keep along their path, the games just open up for them. Why does it feel like it's different for me? I just wish I could understand what I'm doing wrong. It's so close to the end of the season yet it just feels like gold promos will never be it for me. I'll never get them no matter what. Like it's hopeless no matter what role, what champ.