It's hard to understand from your post description whether you completed the in-depth customer development analysis or not. Did you manage to identify your mark

It's hard to understand from your post description whether you completed the in-depth customer development analysis or not. Did you manage to identify your market fit and test your hypothesis prior launching the first MVP? As a piece of advice, you may offer your product for testing / evaluation to the people you've initially interviewed for a lower fee or ask them to price the product.