Yep. You’ll have to run a VPS. Many use digital ocean, I use lunanode (accepts btc). Mine costs $3/mo.

Then you’ll need to connect the vps to your node with a vpn of some kind, I use tailscale, others use openvpn or wireguard.

Then setup a domain, pointed to your vps, and use nginx (or another service) to proxy traffic to your BTCPay.

There are a few guides out there, happy to find one for you when I get a few more min later on.