Small steps.
First step (after reading this), throw the phone into a bag, in another bag, in another bag, each one tied, put that bundle in a box, in a cupboard and into the loft. Stop the doom scrolling, stop the procrastinating. It's addictive.
Step 2 - don't have a todo list, call it a "done" list. Changes the thinking from negative to positive, each on gets ticked off as DONE! a little celebratory Yay, and a small release of happy hormone.
Step 3 - on the done list, have small things, "water the plants", "wash the cup" vs huge things "decorate the hallway" - small things are achievements (see Step 2 a little celebratory Yay),
Step 4 - don't go get the phone until at least Step 5, but don't doom scroll. Put the phone down, switch on the TV, radio, book - anything, break the addiction of phone.
Step 5 - have a cut off point daily for tasks, everyone needs to say "work done" for today, time to chill (see Step 2 a little celebratory Yay)