Realistically, no one is going to use this. Google Forms provides 400 form submissions per
minute, unlimited per day, free of charge, and still more with their $8/mo paid tier (and that also covers all Google services, not just Forms). You're selling 1000 form submissions per
month for $10.
This would have been a saturated market in 2002. It's way beneath table stakes even for a free service today. Google Forms gives you 17,280x the quota for literally nothing, and a million neat integrations with various products (Sheets, Gmail, &c) which you can never hope to equal.
I'm sorry, I've been there, and it hurts, it sucks, but you will be considerably better off stopping now than driving yourself into the ground, selling something that nobody is going to buy, ever. If you need any current ideas, I'm happy to share some of the stuff I've been thinking of - probably not all of it will be good, but there'll be some good stuff in there (I just don't have the time to pursue all of them).
PS: I don't think you need to put 'Jamstack' on your landing page. No one cares what your tech stack is. At most it will worry or annoy some people (the language fanboy types and many more who believe what the former say), whereas it's not going to increase anyone's confidence or interest. In short, you don't want to brag about a necessary but not sufficient condition, especially when it's a highly arguable/contested one. It's an unforced error.