Should I start working on the MVP?

Hello everyone,

First of all, I want to thank everyone in this community who helps others by sharing their valuable knowledge and contributing.

I have been following all the steps that people have taken and shared about their journey to build a business and create something meaningful. I recently came across a problem/need that I really want to solve, and I am really excited to work on it.
So I decided to first seek validation before start working on the idea, and because my target audience is the other SaaS owners and people who are building in public, I decided to share and get feedback from the same, and thus shared my idea recently on Slack and some Reddit communities.

The response was pretty good, I shared with them the video demo of the service it would provide and a clear solution for what it would do, and got lots of comments on the slack post, people talk about how they anticipate using it and someone also asks to pay for it, etc, and on the Reddit post, it got around 16 upvotes (until now) and comments about their feedback.
This was all just through some words and a video demo, i.e. I haven't created a landing page or an MVP. I couldn't share the idea on other Reddit communities because of the minimum requirement of Reddit Karma, and thus this all is the initial response.

Now, I need your feedback on the potential step that can be taken now. Should I ask for more feedback or set up a landing page and share the idea more with people, and start working on the MVP? I also found that there is a section for idea validation on the product hunt and indie hackers community, so should I share my idea here too or should I start working on the MVP and share after the first version is completed?

Waiting for your response,
Thank you so much :)