I’ve started using the Voice over on mac while I still have usable vision, on the chance that my vision continues to deteriorate. That way, I can mitigate any big disruptions later down the road.

I've seen people use external screen magnifiers by just putting a giant, square magnifying glass over their screen. You do have to have some degree of useable vision for that to help though. I've also seen people plug in Braille displays to their computers so they can read what's on the screen tactiley. I don't know if those are as good as screen readers like JAWS though. Sometimes Braille Notes can be a substitute for a computer but not always as computers have more storage. Recording devices also help a lot, like victor reader streams, to store voice notes instead of writing them down. Desktop CCTV magnifiers can help with low vision users to read and write with pencil and paper. Handhelds can work portable too, again these both require useable vision though. I hope this helps!