What you do next with the people who expressed an interest on your landing page will validate your idea: getting to know the problem space better if you have prior knowledge, or getting to know the problem at all if you're an outsider, validating the need and the market, qualifying your potential users, selling or "pre-selling" or getting a commitment of some sort, and expanding.
Are you a user yourself? If so, you have knowledge of your ideal customer and you can figure out how to reach them.
Maybe you can still make the most out of this post and expose your idea, and update your profile with a means to contact you in case someone is interested.
PS:
Are you familiar with Microconf[0]? They have excellent videos[1]. Each of the thumbnails will take you to the appropriate YouTube playlist for that year.
YouTube: https://www.youtube.com/results?search_query=validate++micro...
- [0]: https://microconf.com
- [1]: https://microconf.com/videos
"Ask HN: How do you validate your startup idea when you've no distribution?" https://news.ycombinator.com/item?id=28263375 1 month ago
"Ask HN: Does a landing page MVP work?" https://news.ycombinator.com/item?id=28068450 2 month ago
Personally I'm skeptical when it comes to landing pages (not even MVP). Maybe over the years I've seen too many.
one plan is to start with an idea that's already been validated by someone else, where you have an even more valid approach by a significant margin.