Am I just terrible?

Anyone have a clue why its so easy to tank your MMR due to bad players but literally so fucking hard to pull it back up? At one point I had my MMR at Silver 1 peaking near gold 5 and after multiple AFK's and Shitty laners i've tanked all the way down to Silver 4... If I have to wait a certain amount of days or something please let me know because it doesn't matter if I get my laners ahead or myself... I am still losing.
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