Improve, reach Challenger rank, compete in ERL

Hello, I am a Grand Master player in EUW SoloQ (833 lp peak) who goes by the handle Doros, and I am currently looking for a team to compete with.
I lack previous competitive experience, but I am willing to put in a lot of effort, as I consistently play hundreds of games throughout the Splits and the Seasons. I have a fairly sizable champion pool, owing to my long history of playing this game, as I started back in Season 3, and I was already an ADC player at the time, as I was a Vayne OTP.
My best champs, and those I play the most in SoloQ are Xayah, Kai'Sa and Jinx, and I also consider myself to be a decent Miss Fortune and Lucian player.

I am fluent in French aswell as in English, so feel free to contact me in either of those languages.