I think you should reach out to those who are experts in the field and find out what they think would work, then build something that does that. As an example

I think you should reach out to those who are experts in the field and find out what they think would work, then build something that does that. As an example my partner volunteers with a suicide prevention hotline that also has a chat client, I'm sure they'd love something mobile that works with their chat system, etc.