How is it more convenient to implement a site with referral pages?

Question

CMS

Interested in a ready-made solution or theory of creation. The need for a group of people to make pages with a funnel-type subscription form, there is only one domain, and for each person a subdomain, let’s say email, if you only change it, then it’s not a problem, you can copy-paste the pages manually. But you also need an "About Me" page with a visual editor, and then I fell into a small stupor on how to implement it, because this requires an admin panel for each person.
thanks for answers