Progress stagnation

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Malishious

I've been playing quite substantially the past couple months, after not playing chess since I was roughly 11. My game has steadily began increasing, and in just under 3 months I almost hit 1500 ELO. But recently I've been dipping down back to the low 1400's, and I believe I've almost hit my maximum potential as a player. I'm only 17, but am wondering if there is a way (change of pace, style etc.) to break through and change my mindset. Any advice or tips/tricks are more than welcome!

Malishious

Once again, I do play Blitz mostly since I prefer the time constraint element. You can factor this in