Windows Server RAS with diffrent subnet for more adresses

Question

Hello,

we got simple setup with Windows Server and RAS/DHCP/DNS on the same server.

Now we got the problem through covid we ran out of ip adresses on the default subnet.

The main server is currently on

10.10.29.108 /24

We got our default dhcp scope on 10.10.29.0/24. For the new intern devices i defenied a new dhc scope on 10.10.26.0/24 and connected both scopes through a superscope.
(This works fine, the dhcp gives adresses from both scopes now.)

So now i want my external RAS Clients on diffrent scope like on 10.10.28.0/24

What do i need to do? Since the Routing&RAS already gives ip adresses from my new internal scope, and the clients having issues, i think i am missing something since the RAS cant know the new gateway of the 10.10.28.0/24 subnet?

Do i need add new static routing on the Routing&Ras? Or new interface, with the correct gateway on the RAS scope/subnet?

My goal is to seperate internal and external and get more adresses for my internal again.
(And later on block ervrything out with firewall, expect some services like rdp/DNS to internal from external)