I fear I will be stuck in bronze 4-5 forever

So I was in bronze 5 for a long time, I worked my way up, kept going down and up (Repeated around 10 times) then I hit bronze four, kept winning, then at 80lp, I went all the way back to bronze 5, this has happened around 5 times right now, I have seriously given everything my best no matter what role I am given. So my win rate has gone from 15% to 45% in 2 months, but I am scared ill still be stuck in bronze with like 55% win rate, is this possible?
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