Pre-launch sign-up strategies for on-demand care app for special-needs children 🎊

My co-founder and I are working on building an app that will help families with special-needs children find qualified sitters who have disability-specific experience related to their child. The app hasn’t launched yet, but our goal is to launch it within the next month, and the first area it’ll be launching in is the SF Bay Area

Right now we’re actively looking for pre-launch sign-ups from both the family side and the sitter side. We ran Facebook ads to reach the families for 5 days, getting a few email sign-ups and LinkedIn ads to reach the sitters for 5 days, getting a few email sign-ups as well. I also reached out for help to my friends and family on Facebook to share our page and go a few more email sign-ups there.

I know there's always an added challenge in a marketplace scenario like this but are there other online communities and methods that anyone can recommend to get pre-launch email sign-ups?

I'll take this chance to promote here in case anyone has any friends or family that either has a special-needs child or has experience working with special-needs children in the SF Bay Area, can you please share these pages with them?! Also, if you fall into one of these categories, please feel free to sign up as well! I would highly appreciate this, and definitely willing to return the favor 😁

These are our landing pages for reference:

The page for families: http://careability.co/
The page for sitters: http://careability.co/sitter