Wordpress site has ceased to be indexed by Google robots

After transferring to another hosting and trying to increase the speed of the site, the pagespeed.web.dev issues an Errored Document Request, google adwords writes that the advertisement was stopped because of a link to a non-existent page, and the site disappeared from the SERP.
As I understand, there may be two problems:
A freelancer who was engaged in the transfer to another hosting, deployed it with viruses
The second problem is described here https://wordpress.org/support/topic/pagespeed-insi...
and lies in the fact that it is possible that robots are denied access to the site

You want to solve this problem as soon as possible