what exactly do you need seed money for? what’s its purpose? Is it to keep you eating so that you can finish building the app?

IMO you need proof that people actually want this thing.

I wouldn’t write another line of app code.

put up marketing material and get your market to sign up to be notified for when it comes out.

Treat those sign ups as validation of demand. It won’t be as good validation as actual payment, which would validate the business prospect... but those RSVP numbers will indicate that this is something probably worth investing your time in (and other people’s money in). and you can get your beta users from that list.