Lost what?

All your limbs?

I would recommend going in the search for good reliable plant medicine. Specifically psychedelics.

But in my experience you can start enriching your diet systematically.

I mean by adding natural herbs and suplements that make your body richer and balance and regulate your hormones. (know your hormone cycles aswell)

A couple of them might be:

Ginseng

Peruvian Maca

Cordyceps militaris.

Those three for example will trade your relationship with effort. When your hormones are balanced enough, you enjoy strain and controled stress. When that happens you trade the difficult feeling for pleasure.

And it can be accomplished by adding those to your diet. Take them very regularly, at the same time in the morning every day. Peruvian Maca is my very best because it is also so nutritious.

So if you get pleasure out of moving and performing excercise, there is momentum you have to take advantage of.

Then in the psychological aspect I would use magic mushrooms microdosing. That would take you to a "Why not?" learning playing state. And teach you a lot in the way. (mushrooms are masters)

Then I would change all the feng-shui in the house. All the disposition of things and stuff and furniture. I would create space for relating myself to the floor, like a mat or carpet. I would hide technology and distractors. I would get closer and obvious a couple of dumbells or whatever excercise gear you would like to use.

Make it obvious, make it available, make it attractive. And do the opposite to the things that are taking life away from you.

Then be compassionate to yourself. Know that every little thing makes a whole difference. 100% different. Even one squat. Even failing at an excercise schedule. Go look for differences. Even tiny ones. Treat yourself with love respect and understanding.

I will repeat this: Every little difference makes a 100% difference, and it compounds exponentially. That creates momentum.

But after all, you want to create systemic changes in which you can have an enviroment and a body and a psychology that invites you to move.

This you can only create if you can imagine yourself being different and a better version. And when mind friction comes between you and that ideal you just don't hear it. Don't feed it. Don't pay attention to all those excuses and problems. When that happens to me I repeat : "I don't really know" "What do I know?" So you create a void in consciousnes in which you are at a thought of distance from the thought you would be having in the way to a better version. Be in the not knowing middle.

Like when you say "How do you find gym motivation and healthy eating habits when you’ve lost it all?"

Are you sure? How do you know? What does it even mean what you say?

What is all? What is it lost? What is it that you gained in the way? (at least knowledge of what's bad for you so you can compare)

Give yourself the benefit of the doubt and you will be at a thought of distance from a new self. And that difference is 100% different than your prior self. Stack that.