Wrong target content in the SERP regarding language

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Hi Guys!

I'm currently under an SEO issue and need some advices about it. My problem is that, Google doesn't show the good pages in the SERPs regarding the languages.

In fact, I translated some content in Italian, German, French etc ... When someone use the branding name of the project to find it by google, if this guy is French, German, or something else, Google shows the English version in the results. I of course would like google showing the German version for a German guy in the SERP ...

I already made properly my hreflang tags.

Some tips to fix it?

Thanks a lot in advance! And hope everybody had a merry christmas!