Need advice/Help on an old bad habit

I started playing back in late season 4 (fond memories of {{champion:19}} using feral flare), and I've gotten to gold the past couple seasons, already being back there myself. I had learned from my Diamond brother that a big thing holding me back is playing with a locked screen, but it seems no matter what i try, I keep reverting back. If anyone has any advice to help me out, it'd be very appreciated :D
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