Season 8 is the worse of lol : new runes prevent any comebacks, glhf plat is closed to newcomers now

well i was almost silver 3 at the highest last season, wanted so much to reach plat this season, and i don't know how the fuck i can do it, seems impossible rn , got placed bronze 4 this season, climbed to higher bronze easily for a while, i could climb easily up to 65% win rate and then, that fucking matchmaking started holding me back harder than ever, i was planning on playing only diana, vayne and tristana, since they are my best champions i think, but yeah when everything started to fuck up with a lot of teammates feeding to a non-return point, i could not do shit for my teams even while trying all the fucking hardest i could and then i started getting hold back to a little higher than 50% wr, no way i could 1v9 so i started spamming jg, xin first, it helped me for a while but then once i again i started not being able to fucking do shit to climb again, so i tried using lolmasters champion select thing for good team comp and freelo pick, climbed again to bronze 1, and then, even with this i keep getting hold back and honestly, on the kat, master yi and kassadin games, my plat 3 friend was borrowing my account since his one is banned for 2 weeks.