Absolutely do not expose your server on port 80. Http is unencrypted, you’d be sending your login credentials in plaintext across the open internet. That is Very Bad™. If you own a domain name, you can set up a letsencypt cert fairly easily for free. Then you could expose 443 and at least your traffic will be encrypted in transit. It won’t solve the other potential issues of exposing your instance like brute force or ddos attacks, but I’d consider it a bare minimum.

If you use a VPN like many others are suggesting it won’t matter as much because the unencrypted traffic never leaves your local network.