Non-technical Wordpress migration
Its going to cost $200 to $500 depending on group size where size goes from "under 1000" to "tens of thousands".
You'll need to find a host and buy a domain name (I can advise on that).
It WON'T run a listserv, which means you can't post to the group by email and users will not be sent new posts by email.
You'll need to find someone to admin the site.
You should seriously consider a transfer to groups.io
Contact me here