Have you ever looked into becoming a therapist?
It would fit both your need to do something which is more involved than a job, but also allows you to still be flexible about working hours and your time spent working.
It might also align well with your personal circumstances in terms of experience and in terms of your current level of education.
If that's not something you'd be keen on, do you feel that you'd prefer to work in an office or a workshop environment? Or would you prefer something which offers a mix of both?
Do you have any particular opinions about working outdoors at all?
What was the most important aspect of your A levels - was it the content or the social aspects of being around your peers? If you were to go back to university to get some additional credentials, would you choose to do an online program or an in-class program?
I work as a freelance software developer, and none of my clients have ever asked to look at my credentials or my diplomas. They want to see my portfolio and what I can do for them, how I can solve their problems. There are many resources online, you can train for many jobs without having traditional qualifications, especially in the tech field!
Alternatively, I would look into the open university, they offer online and fully flexible degrees and they don't have any entry requirements for their bachelor programs for instance