Two specific mistakes I did fix along the way: my landing page force redirected visitors to their browser language, which can hide the other language versions from crawlers. Google's own docs say offer, don't force. And my internal links pointed at page.html while my sitemap said /page, so Google was discovering every page at one address and being told the real one was another. This could have also contributed to the limbo my website is in (although Gemini says that that doesn't happen). Fingers crossed