And worse of it in Op case to his difficulty in finding a job as he wish is as a result of his health problem. According to the Op he's suffering from a leg and back health challenge and you and I know that no manager will want to hire such a person, for them it's a liability in the search for efficiency and great productivity.
I realize the employment rates are not the same everywhere but I thought in Europe the chances of getting a job are a bit higher, but yeah competition is everywhere, and due to that the chances of getting one decrease. That's another issue. And speaking of the OP's health problem, if he is doing a remote job then the company for which he will work doesn't have to care about his health problems. This is one of the big benefits for companies they don't have to spend money on their employee insurance or other health-related problems.
Because that OP would be a freelancer for them, he is not going on-site, that's why he will miss some offers but get some too. Like he can work remotely anywhere even in the hospital if they allow him to. The point is, that remote jobs are more easier than Onsite ones. With back pain, OP can become a freelancer with any good and demanded skill. All he needs is a little time but if he is not a computer Joe then that might be hard.