How do i fix my mmr?

So , when I started playing on this account I was winning about 23-25 lp on ranked games...I took a while and the lp gain started to shrink to 20 lp.Then I had a 5-6 lose streak so I started to gain only 17 LP and lose 18 LP.Now I am currently on a 11 games win streak but I still gain the same LP (18 LP).My Win Ratio is 56% btw.What do i do to start gaining again atleast 20 LP?
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