Our problem is determining market size; what's the market size for technology hat can predict severe mental illness situations potentially weeks before they happen? What's the market size for tech that can prevent suicides? Since nothing else like that exists, there's no way to predict how much that would be worth in terms of an investment deck.
Look up the number of PTSD-qualified therapists in the USA (or just therapists if "PTSD-qualified" is not a meaningful distinction). Survey a random sample of them and ask if they might use technology to help diagnosis and to prevent suicide. Multiply the percentage who say yes by the total number of therapists. That's your slide deck market size.
As someone who also works on this, and thinks about startup possibilities, I understand what you're going through. Sometimes I wonder if it's possible to sustain a business like this at all or if you just have to work toward an insurance company buyout.
Maybe we should all start a therapy group!
It is insanely frustrating when fundraising worthiness is so tied to how good you can make 10 keynote slides. Changing the world doesn't always fit into bullet points.