Went from Silver 1 to Silver 4 in 1 week wtf

I've been around silver1 for around 2 months until recently when I started going on more losing streaks than winning streaks. In the span of a week, I went from 83 LP Silver 1 to 0 LP Silver 4, about to get demoted to Bronze. Is this just luck or is my mental capacity rotting and I am just a shit player?{{sticker:zombie-brand-facepalm}} I feel liek I am good mechanically but at the same time I feel like a useless %%%% in teamfights as I dont know when to engage or leave a fight. I also feel like most of my games are feast or famine where I either go 10/0 or 0/10. Tbh. idk wtf is my problem. If anyone call help me out or teach me something, that would be nice.
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