My advice for security is don’t expose anything to the Internet unless you’re sure you know how to secure it. If you want to be able to access self-hosted services remotely, setting up a VPN is the way to go. OpenVPN is gonna be the most widely supported way of doing that. In fact, based on a quick Google search, it looks like your router has an OpenVPN server built in. If you’re willing to put in some effort for something more modern and performant, look into WireGuard.

Another benefit of having a VPN is that if you set it up to allow access back out to the Internet, you can use it to mask your internet traffic while you’re connected to an untrusted network.