How is a player supposed to climb?

So i went on a losing streak and my mmr went to shit, like low 1300s in gold 5, so my question is when you hit that point you are matched with low silver players and vs high silver and an occasional gold 5 like me, every game since after my mmr dropped our team had a lower mmr and the opponent had a higher mmr from anywhere between 40 to 200.

then i go on a win streak to my promos, fail and lose two more landing at the same position but my mmr is now normal, but now im getting matched vs gold 2 - 1 on the opp team and silver 4 -1 on mine and winning these games still gives me 17 lp and if i lose i lose 21??

I fail to understand your methods because theres no way you need to make it this hard to climb one division in gold 5, please help me understand.