Sudden Drop from #1 to #12

[Marcmayo]

Hello Moz community,
I am really happy to be here and I start right away with a quite tricky question I'd say.

We are running Star-Registration.com and in March switched platforms to Shopify. All the Redirects etc were done according to standards.

Nevertheless, Star-Registration.com dropped in May (2 months after the switch) for "name a star" and "buy a star" from #1 to the 2nd Page of Google Results after being on #1 for almost 3 consecutive years. We had a similar case with their german website but the german one is back on the top 3 rankings again for all the important keywords.

I attached a Screenshot of the Search Console stats
Any suggestions?

yv6pep

[Libra_Photographic]

Looking at your results I would hazard a guess that you were affected by the Google core update Dec 3rd.

There was a major upheaval, I felt if too. All that can be done is to analyse your sites and read through why you may have been hit.

Take a look at the MOZ blog post here: https://moz.com/blog/googles-december-2020-core-update