In terms of attracting people to use the application, you could start with approaching NGO's that support the cause. You could explain them your agenda and ask them to help you promote the application.
Interesting idea mate. I myself have spent some time with caregivers, and I agree how difficult it could be for them to adapt to the society. I believe a platform which allows individuals to appreciate all the foreseen hard work and sacrifices they have made will help them adapt to society and help them socialize.