How to access the internet through a VPN client?

Question

Debian

In general, the essence is this.
There is a server on debian 10.
Clients connect to it via vpn. They are routers on OpenWrt.
Clients receive an address like 172.16.0.2-200
Clients have access to the Internet
The network looks like this for clients.
Client ip 192.168.10.100
gateway 192.168.10.1 The

question is which way to dig or which routes to prescribe so that the server can access the Internet through the client's Internet.

Now, having added routes, I can ping 192.168.10.1
But how to make requests to the Internet go through it.
If you have questions write