Hi @Jlb ,
We just had this discussion 2 days ago on employment and mental health, hope you will find this helpful.
Are you aware of why you have a hard time maintaining jobs? For example, it could be taking too many sick leaves due to health issues, distant location of workplace, work overload, trouble with managements or coworkers, inflexible work arrangement, etc.
Once you figure that out, you can align career option and work arrangement that suit you.
I have been on full time, casual full time and self employment. I find employment helpful in getting more work done as I have others to keep pushing me forward. With self employment, I tend to slack off usually using health issues as an excuse and my clients will go easy on me. Bosses are not always as sympathetic in terms of pushing deadlines or cancelling projects because of medical issues. At that time I was employed and working from home, so I can cover up my health issues easily.
I am currently on a study/work mode and will be doing a PT employment and continuing self employment as I already have a good flow of clients. I cover 3 sectors too and a good variety keeps boredom away.
Hopefully you are able to combine both of your career roles too, it will make you stand out in the industry.