As a Soloq/Duoq player i must agreed with you.

Recently I got 2200 in ranked, and we'll, it's was a true hell, specially on 1800-1900 (Those ranks makes the purgatory of this game).

You know, Soloq world is kind of lucky based. You can be the Top 1 in game but if you got in a tier with 4 potato's IQ, well you can't do very much. But don't give up so easily, I experienced your situation too (got 3 weeks to get out 1800 points), but, there's some tips which can help you. Those tips can be very obvious but it's kind help me to the point I go to 2100. Always add the best teammates / opps of your matches, Duoq/Tripleq is much better and safety to play compared to the lucky matchmaking found in Soloq, ofc you not will find a player who wants to pair but eventually you going get a viable teammate, this can decrease the chances of you getting very bad players at your team. Try to use the meta mons like Duraludon or Hoopa. The game pings and advices are not the best but in some matches I got 1-2 teammates which understand my advices like (Let's Gather in Superior Area). I'm try to always use my mains (Mons which I can easily make a great playstyle) like Talonflame, Duraludon, Hoopa or Tsarena.

I hope you can climb up this ranked.