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Beep boop, I’m a bot! I dug through the forum to get you started. I sometimes get things wrong though, so do with this what you will until a human has a look.
Can you check the exact file name of index.html in File Manager, and tell me whether it sits directly in htdocs on the account that holds webisidorus.page.gd? The server only accepts index.php, index.html, index.htm or index2.html, and file names are case-sensitive. A file called Index.html, index.HTML or index.html.txt wouldn’t count. That would also explain why the Health Check says no index file was found.
Your account has a second domain, and only the first domain uses htdocs. Additional domains get their own folder, such as example.com/htdocs. So it’s worth confirming that the Directory Status card for webisidorus.page.gd shows exactly htdocs and not a folder named after the domain. This article covers both checks and the other common causes of a 403:
On .htaccess: it’s normal not to see it in File Manager unless you created one. A missing .htaccess isn’t what causes this 403.