How the fuck did you get out of Silver 5? Took me forever to get out. Matchups where it was like Wood 5 vs Diamond 1's... and I was on the wood team 50% of the time, essentially trapping me in a constant win, lose, win, lose, win, lose...
I ended up in Silver 5 in the first place because Remake didnt exist yet, 4/10 games had an immediate afk, 2/10 had rage quitters in the first 10 minutes, the remaining 4 went really well with all wins. At one point I had 3 in a row after 3 losses in a row giving me hope I might not get a horrible placement. But yeah 6/10 of my placement games were complete throwaways.
I had that exactly feeling as you when I finally managed to win my Silver 5 promos thanks mostly to Riot giving a free promo win when winning a game near 100lp so I managed to pull off the other win with my 50% win rate and I've been climbing steadily since I got out with a 70% win rate.
Also I just finished a Silver 2 game and the enemy team was serious wood. We steam rolled them so hard and thats saying something since top and jungler did not communicate properly about lane swapping. Quite frankly if I wasnt a fed Sona their Lux would have carried them to victory because my team was pure squishes and they kept getting caught in her QER combo. Which anyone knows is face melting death if you're not a tank.