Could have been hit by Google's MAY 2020 update. Although "ranking for 7 days" looks like personalised results to me, to be honest.
Firstly check it's in the index, so type into google:
If it's not there, yet your manual penalty section in Google webmaster tools.
If there are no penalties, then look into increasing the quality of your page(s), & if you genuinely think your website is flawless, then seek professional help.