The method-method: Keep reading about, applying and stacking methods, finding out which ones work for you.

Be meticulous about them, e. g.:

• Can't interrupt a pomodoro session, not even to pee. If it does get interrupted, e. g. a look on the phone screen when it makes a sound, the session is aborted and marked a fail.
• Work strictly by todo list. When something is done but wasn't on the list to check off, it doesn't count as done. Instead of guilt mode immediately, do ONE item from the list and then procrastinate. When there is no list, start the list and then do your procrastination.
• Guilt-free procrastination: Set a time when you stop. E. g.: I keep doomscrolling until 1:10, and then do the thing. Nice thing is that this is now "legal doomscrolling", shorter, but guilt-free.
• Get started. Instead of 0 pushups, do 1 pushup. Instead of no meditation, get into the position and take three deep breaths, done.

Tbh, with all that, I still do only a fraction of what I should. But at least something gets done. Becoming just 70 % ineffective, like you, is my current goal :-) But maybe it helps you progress from where you are anyway.