Forget "motivation". Motivation is not practical. You must remove distractions.

Use Cold Turkey Blocker, turn off your phone and leave it inside a drawer, uninstall video games, delete every social media app.

Eliminate every cue that makes you procrastinate.

This is the ONLY thing that worked for me in over 6 years of trying to fix procrastination.

Without distractions, you can only work. Then work eventually becomes interesting.