When Do I Move On To A Next Idea?

Hello folks. I recently started working on the idea for a new appointment scheduling software, I've read a lot of tips on finding problems to solve and one suggestion was to find competitors and niche down or add more features. That's how Punctuali (https://punctuali.framer.website) was born (my differentiators would be pricing, booking page customization and sending emails directly from the site). I figured the existence of competitors was good enough validation and started working on the MVP (I wanted to go through the entire SaaS creation process for the first time, setting up hosting and payment processing since it would be a nice project for my resume regardless of profitability).

I built the landing page with Framer since the one I built in React wasn't as attractive and I wanted to build fast, I posted about the product on my Twitter (237 followers), got some likes but no waitlisters), so my question is, when do I decide when to move on to a new idea and how do I know if it's the idea that is no good versus the landing page being bad? Thanks in advance, have a nice day!