Should I continue with the wedding?

Hello all! I (30F), have been in a relationship with my Fiance (32M) for 5 years, when we met, he was working and would take care of me and I am also working. Everything was perfect until 2 years ago when he was in a bad car accident (luckily it was not that bad, he just has a frequent painful back and neck, he can still function normally despite this). He has not been able to work since, it's been over a year and he has gotten surgeries but cannot work any strenuous jobs still. He has no college degree or trade and worked for his family business in construction which can be very strenuous.

I have been asking him to look for (and also helping him) to look for jobs that would require him to sit and not do any physical work and he always just dodges the conversation or agrees to look but never does it. He says his back hurts but is still and play video games - which is why I don't completely understand why he can't do office jobs. I am doing very well at my job and recently bought my own small house, however, I also want him to do better financially so we can buy our own place together. I stay by myself and he still stays with his mom and dad.

I understood for the past year why he was not working because of the accident and the many surgeries he got. But now I am feeling stressed because I feel he has gotten comfortable with not working. The doctors did say he must not do any physically demanding jobs until he completely heals, this might take an extra year or two. He is scheduled for another Doctor appointment in February and this might lead to another wasted year without him working. Depending on what the Dr says.

We are preparing to get married, but I am not sure if I want to commit to someone who does not have goals and has excuses, I asked him to maybe do some online courses while he heals so we can get an office job and he just won't do it. I am tired of asking him to plan for our future and also do not want him to move in with me because I feel he will get comfortable and not pull up his socks.

I also do not want to move in with him to his parent's home because I have my own place. I have also always wanted to have things of my own so I do not depend on a man and also to have financial independence. We have spoken about starting a family but I don't want to have kids with someone who does not have any ambitions and will not have any back up plans should things go wrong.

I do understand the emotions he is going through and we have had countless conversations on the possibility of him not fully healing and what we need to do incase that happens. He just won't change, I love him and we get along very well but I can't look past the lack of ambition and fixing his finances.

Last year, we had a heated argument where I gave him an ultimatum to say that if he doesn't get his sh*t together, I will leave, he did discuss his plan but nothing has happened since. I am tired of asking him to do better but I am also being empathetic so I don't know if I am being unreasonable by how I am feeling.

Should I leave him or stay and figure it out? His family loves me and is very supportive of us, they also offered to pay for the wedding but I just don't know what to do anymore.