Using ProtonVPN probably isn’t doing what you want it to do, since the port they will give you is random, but for your website you will want ports 80 and 443 exposed.
CloudFlare will hide your IP will properly forwarding traffic (and other benefits, like caching images on their CDN, if you want them). Also their free tier is more than enough for something like this.
This will be useful if you are trying to let multiple people share your computer remotely. If you are trying to set up personal game streaming for one client at a time, try Moonlight and Sunshine (more mature, easier to setup, works on any hardware).