No special expertise from my end, just reading sympathetically and figuring you deserve an answer.
It sounds like you are a person who seeks to have meaningful engagement with their work, even if a driver of the work is financial need/desire. Having reached a partial FU stage, something approaching CoastFIRE, you need/want work that combines pay and meaning.
As such, congrats on reaching the current stage. Clearly you've done well by establishing real income in fields often inhabited by passionate people who work but receive little income. I applaud the idea of responding to particularly good opportunities when they come, such as the insurance network you wanted to get into, and the grant-driven acupuncture office for the low income clients.
It seems there are tradeoffs in balancing the different work sources and also in choosing the exact level of work volume at any given moment. It looks like you are clarifying your thoughts well by focusing on the right timeframe - you expect to work regularly when possible for several more years, and are sorting out the opportunities based on how your goals are likely to be best filled during that time.
Where you wonder how to balance several different factors, some of which are impossible to quantify in advance, one idea might be to focus first on the most important thing, then the next most important, and limit the number of criteria you consider at once. That would simplify the decision making so that you don't have a confusion of multiple factors at once. For example, you could decide that:
1. You will do the special opportunities that you recognize as fulfilling your real goals/passions. When in doubt, you will accept anything you've "been thinking about for several years" or "been wanting for several years" as something that's important - respect your persistent thoughts as a good sign.
2. In the time that remains, you do will do the other paying work that you like up to the limit of your ability. No exhausting yourself, but up to the limit of your energy, do the remaining work available because you're not FIRE yet and it's stuff that fundamentally you do like. When in doubt, go ahead and work, just work with dignity and care. You never know when such opportunities will dry up, or extra money will come in handy - for now, do good work.
3. However, these second string activities will be cut if they become "too much". You are grateful they're there, but confident you have enough good work, so rather than overload for long, pass them to the next good practitioner.
Congrats on being in the zone of healthy success. And if I'm off in my reading of your situation, feel free to clarify. It's your life! Best wishes,
@dizzy!