To me, the insight is that the less you care about the future of your "product", the less time you have to put into it.
I look at the linked site, and all I see is "Minimal". I don't see any viability, I don't see a product (identifying what's being sold takes a few clicks). I also see a bevy of GDPR violations. I see an ADA (or the EU equivalent) liability. I, as a security conscious developer, forsee a disaster of a security story.
I see human scaling issues, as everything slightly out of the ordinary that happens requires an email to an address which is on the surface completely unrelated to the site itself. I also see 842 social media trackers blocked with standard FireFox settings (though I guess that falls in with GDPR violations).
I also see some potential legal liabilities, as all of the agreements are between the users and "Bethan Vincent". That lack of separation could put the owner in a lot of hot water should any of the above liabilities become a reality.
Most of these won't - can't - be solved with a technological re-write. A lot of them will require a fair bit of re-writing the entire business model.