Your next step should have been your previous step, i.e. make sure there is a reasonable demand that your app can satisfy:
* Did you speak to future customers to figure out if their pain points are real, i.e. they are ready to pay you?
* Did you create a landing page that collects emails of people who want to use your app?
* Did you find a couple of customers who are so desperate for your app that they want to get into beta or maybe even pay you for whatever you have on your hands?
There are tons of low code or even no-code options out there that can help you build a landing site, a mailing list and everything else you need to figure out the product-market fit [0]. My goto is currently WordPress + Elementor (visual editor) + Yoast (SEO) + Breeze (performance) + Cloudflare CDN (moar performance!!) + MailChimp (mailing lists).