Need Tips towards maintaining elo

Working my way up to level 30 as a newbie to league, i always considered myself to be somewhat above average, seeing as how I could carry the team with pretty much any role. Even playing normals casually, I can easily carry games as any role, and arams are beyond easy when I have a champ I play all the time, such as azir, blitz, or gnar, but thats not my problem. My problem is ranked, It seems that no matter which role i play, every single other lane fails to even freeze their lane, and always manage to lose them. Having started out in bronze 1, i believed that if i managed to play my first few games well, i could easily make up for the 7 promo games that i had lost during my 10 game promos. Unfortunately this does not seem to be the case. For the first few games, ive had adcs go 0/16. Ive had games where im the only one who killed an enemy champ, and ive had troll bans and picks, such as quinn jg without smite, etc etc etc. After having lost EVERY single game since having been placed into bronze 1, ive been deranked and now currently reside in bronze 2, where i lost 2 games so far. Most people say that if you say your teammates are always the reason you lose, then its your fault you've lost, but I dont see how it could always be my fault, even when I make it to every team fight, land my ult on all the enemy team, and manage to get an ace within 15 minutes, then end up losing due to getting aced 3 times in a row. I've tried every single role, attempting to see what i could do better, but it seems i do worse and worse the more i try to help my team. If this is considered being on tilt, then i've been on tilt ever since ive started playing normals.

I really badly want to get out of bronze, but seeing myself win my lane, then lose the game since jg doesn't gank other lanes, or bot lane is feeding to the enemy through diving at lvl 2 under tower, I really don't want to play league anymore

All I'm asking for is for any advice any higher elo players could give for carrying my team better, since being supp to an adc who constantly harasses me is no fun. I've heard about not playing for the day and trying again tomorrow, but i can't break the cycle. I don't want to end up in bronze 5, since seeing as how terrible teammates can be there, I doubt i'll make it out. I just want to be bronze 1 again.

(Hopefully there are other players out there who are dealing with the same kind of problem, so we could duo)