Level 24, Matched with Diamonds.

So I started playing League, transferring over from playing Dota at a high level, I'm not completely new to MOBA Games, so I dont expect myself to be matched with the worst of the worst, but for several games I have been matched with Plat 2 - Diamond 4 players every single match. I don't understand how to lower my MMR because losing obviously is not working. Anything I can do to help with this?
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