PDA and/or ADHD (executive function problems) – It took reading a bunch of comments to realize that Autistic Inertia is probably just comorbid ADHD executive function challenges.

How to ADHD on YouTube has a lot of great videos on various ways to manage problems like this. Wall of Awful, Motivation Bridge, Procrastination, tools like SunSama, Pomodoros, Bullet Journals, body doubling (co-regulation for adults), accountability buddies

More of the same:

What is autistic inertia? https://autismawarenesscentre.com/what-is-autistic-inertia/

I’m not sure that giving things a new name is helpful. It’s executive function difficulties no matter what the “reason” is and know that means it’s easier to find solutions.