I have had this problem before, not with an SO, but with a friend. They seemed to be in a deep depression and basically spent their whole day online, doing nothing of any real value, they had been like this for multiple years from what I can tell, spiralling deeper and deeper into a self imposed depression. I pushed and pushed for them to get a job, get a hobby, get anything to motivate them to do more. Eventally, I gave up. Every time I asked they had an excuse, "The world was scary", "They were not ready", "They were not comfortable with who they are", "They did not know how to". Each and every time I countered, tried to push them.
I only knew/know them online, and eventually had to give up. It seems some people won't DO anything with their lives unless absolutely forced, and sometimes... it just is not worth stressing yourself over. Perhaps if I knew them in person I could have done more, but as it stands, I did literally everything I could and they refused to act.
If they won't listen to you, even after you make things quite clear about what they need to do, there really is nothing else you can do as far as I can tell.