Serious question about MMR and LP
So, if anyone knows about this, please give me a hand here. I am gold 5 with 0 LP. I didnt play for a while after getting there because I wanted end of season rewards. Now I started playing again, got to promos to gold 4 a couple times and then went back to 0 LP because matchmaking seems to like nullifying my progress by matching me with feeders and trolls whenever I hit promos. But that is another story.
Now the question is: when I restarted playing, I was getting 18-23 LP per victory and losing 14-16 per loss. Now I get 10-15 per win, and lose 16-18 per loss. This way I can't do anything because even if I go positive with wins it still destroys me as soon as I lose a game.
The question is: why the hell is this happening? And also: is there a way to revert this trend? Because if it keeps doing this I will never be able to climb. Does playing normals affect this or not? What should I do now?
This is quite frustrating, I could have gotten to gold 4 in about 2 days and now because of an unlucky streak I am stuck with 0 LP and can't get out...? If you have any insight on this please let me know. The situation is quite discouraging right now...