This is likely safe. If the site is completely static. If it updates periodically and you care about how quickly those updates are visible to the world, different max-age settings might fit better.
I add new article every week. I don’t have any user interface and dynamic content.
So what should I do?
How are those rules modified in the first place?
You can use a Cloudflare page rule, or configure the header from your server. When you add an article you could clear the cache manually, see if your platform can do it automatically, or set the timeout short enough that you can just wait it out.