You can even use a box on your home network (or even your router itself with a little elbow grease...) Many routers support popular DDNS providers, and most ISP

You can even use a box on your home network (or even your router itself with a little elbow grease...) Many routers support popular DDNS providers, and most ISPs don't block port 80 or 443. It may be against your ISPs TOS because they don't want you hammering their upload capacity, but if you put it behind a free-tier CDN that soaks up the spikes (e.g. Cloudflare) then they're unlikely to care. Setting the whole thing up only takes a couple hours (if you're inept like me) and you're in complete control.