Someone to help me from S1 to G5 please :)

So, mildly weird. I was placed s4, won pretty much every gave up to s1, and it's as if I hit a wall. I win 2, I lose 2, I win 2, I lose 2. I've had multiple people who are high plat jump on another account and help me out, and that hasn't been successful either. It's as if there is a curse on my account hahaha. I wouldn't mind to keep giving it a shot though! Add me in game if you feel like duoing, if you think you can handle the task.