Unable to Actually Climb in Ranked

So I'm writing this post as I guess a complaint and I would ask for no flame/toxicity/troll as I'm genuinely struggling to climb PLEASE BE RESPECTFUL.

I've been playing since middle of season 2 and didn't actually start playing "seriously" and ranking until season 3. I'm a hardstuck Gold 5 player who mains botside (I.E ADC/Support). I have played all roles and seeing top is my weakest role I try to avoid that as much as possible. When I first started this season, I had a 65%-70% win rate. Climbing went well because each win would give me 19-23LP while losses would only bring me down about 18-20LP. However ever since I hit Gold 5, each win would get me only 13-16LP while losses would drop me about 19-23LP each. And I am genuinely curious as to how I can climb? One instance I was duoing with a friend and we won 4 games in a row; started with 1 LP in Gold 5 and ended with 46LP, next day I lose one game and I am back down to 25LP... So at this point IDK what to do. (I have a low 51% win rate now) Also curious to see if anyone else is struggling like me... ** Someone help ;n;**

[sg-soraka]