I believe it is good to learn to be on your own for a while, it helps you figure out what you really want for yourself, but most humans are social being so don't try to accept it as the new normal as this is clearly not what you want. But it sounds a bit like you ask for advice for that.

It sounds you likely want a new partner, so .. at some point go out and find one. Not a replacement, your old partner seems gone, you want a different person you want to start a new life with.

And if you don't want a different person .. then you should first get over the divorce with your last partner. Otherwise it likely won't work.

(And aside "I would blame depression, but I have a great psychiatrist who has me on antidepressants, anti-anxiety meds, and mood stabilizer" those things can have side effects, meaning you are stable to do your work, but are otherwise stuck emotionally. Therapy is a bit more, then taking meds)