our search engine results are messed up after exchanging domain

Hi,

Previously we already have wordpress website (Wordpress A) with certain domain, let say it is called (mywebsite.com)

and then we create a new wordpress website (Wordpress B), We try to migrate the landing page to this new wordpress website.

we connect the Wordpress B to our main domain i.e mywebsite.com

and for the old wordpress (Wordpress A), we make it as subdomain v1.mywebsite.com/

we have connected both website to Google Search Console.

but the problem is, our search engine results are messed up. it seems google only index v1.mywebsite.com even though we try to type our own company name as a keyword in Google Search Engine. it has been two weeks already since the migration

if we try search using site operator

site:mywebsite.com

I can see both the v1.mywebsite.com and mywebsite.com

what went wrong and what should we do? please help