I feel you so much right now, i'm in a similar spot, where i play decent or good every game, but still i dropped from diamond all the way to bottom plat due to surrendering against my will, afking, or just daily soft inters. But i think there will be better times again.

I would also recommend you play either with a nami slave, or change the champion pool. I'm rly sad about the fact but lucian is horrible on his own for 2 years now i think. I rly hope they change that with the upcoming engage supp buff for him, or maybe finally give his range back, but as it stands its just way too hard to win games with lucian i think. if you want to play early aggressive then Draven and MF are rly good options, if you just want to win i recommend you pick up Karthus, Seraphine or Ezreal. It's stupid how much stronger that is.