On Google Search: “martiaux-marcel”. Appears result :

My website is not new, it has been online for months, nearly an year, but it is not indexed or found by google. If I use a url shortener for social-media, that url is found, but my website url is not.
I have added sitemap, etc, but nothing works. Not sure what else to do. When I test live url, it is all alright.
It is a Nextjs website, hosted by firebase. In case that has any influence.