how do you stop procrastinating when you’ve already fallen out of a good routine?

i was actually pretty disciplined for like 2 months. gym, reading, guitar, chess, journaling, studying, etc

but for the last 2 months ive become insanely inconsistent with basically everything i doomscroll for hours, procrastinate every day, and keep telling myself ill start tomorrow

the biggest problem is that i genuinely need to study seriously for my entrance exams, but i just keep wasting the day scrolling

if you’ve been through something similar, what actually helped you get back into a disciplined routine?