Unpopular opinion: Smurfing doesn't ruin games (Hear me out)
Sure the idea might be toxic in some way or another. But think about it this way Smurfs generally have high mmr from the start, so you'll see them in gold games rather than bronze ones from the start. And if they are ACTUALLY smurfing, they will skip most of the elos that are lower just by default. As far as i know riot tracks your apm and as a result can indicate whether or not you are new to the game. As a result if you're a fresh 30 they will put you where your actions have shown in both pre 30 and in consistent behavior.
Not to mention smurfing would indicate that the top 2-3% of players are going into games. Meaning their numbers are much lower than yours. So if anything its just rare. And very well might possibly be, that they are just better than you and not smurfing. Just some opinions for thought