Diamond 4,5

I stood like 4 mounths playing constantly soloq in diamond 5,then suddenly i got into diamond 4,i scored like 97lp then i went to 0 :) and i got demoted for loseing 2 matches on 0 lp ... then i played 2 matches i got 25 lp i lost one i got -25lp ?! How can u rise in these circumstances?
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