The problem with publishing / DNS

At this point, the configuration looks as follows

There is a - on which there is a site on Wordpress
There is a desktop game server correlated with it, which somehow connects to the domain (when DNS is changed - it stops working)
There is a subdomain
In which, when you change the to DNSy - Webflow
The connection between the payment gateway and the ticket operator stops working.

I want to somehow handle this so that I don’t interfere with what they already have natwady there, but so that when I type a new page appears on Webflow

Here is my site Read-Only: LINK
(how to share your site Read-Only link)