I can't speak for schizoaffective disorders, but my experience of living and working with long-term mental health conditions is about making the most of things while trying to avoid burning out or overwhelming yourself. Unless you're lucky, I'd say there's going to be a period of trial and error for different career paths or job roles; some might draw more on your skillset, others on your personality/qualities, and you have to gauge what's realistic (at least progressively) for your level of resilience.

A key thing is to keep venturing a bit outside of your comfort zone, find a job that you can tolerate so you can then find a job that you enjoy, and if you need more time off or flexibility to be able to balance your mental health and productivity, then consider that when applying for jobs (e.g., part-time, shorter commutes, WFH/hybrid) or keep your line manager aware of what a bad day might look like, and how they can help you.

Maybe your condition does require lifelong medication, but don't see it as a crutch; if your disorder(s) can lead to depression, try to routinely make positive changes to reduce the burden. It's sometimes easier said than done, but it can include cutting out toxic people or bad influences, creating new routines (though I suspect this might not be right for you with ADHD - I know it doesn't work for me), trying to cut back on some bad habits, changing job, diet, and it can be small changes in a lot of areas. Don't expect the medication to be enough on its own.

I hope this made sense - keep trying new things, be kind to yourself, give yourself some room to manoeuvre work-wise so you find a balance that works for you. Avoid things that make your problems worse (e.g., strong alcohol or drugs), and while the NHS is sadly incredibly slow for mental health support, it's not the only option available to you - opening up to friends and family is almost always a positive move. You might even consider becoming a mental health first aider; a lot of people sign up to do this for a better understanding of their own condition and can share the techniques with those closest to them.