Ask HN: Should I build this SaaS project?

I have yet another SaaS project idea but this time instead of doing everything and fail I don't know whether I should start working on it before validating it or not.

I have seen lots of people post on twitter that they attracted lots of user by reddit posting and making TikTok videos.

I have already bought the domain and made a basic landing page: https://mybraglog.com

The idea is that you add your achievements and AI will categorize them, you will have reminders that you have done this cool thing and get long term reviews and impacts of those achievements.

Does this sound interesting to you?

Most people follow advice of others on Twitter and sub-Reddit's like r/SaaS but this time I wanted HN advice.