or should I quit now and switch to something else?
You can find a similar thread here: https://github.community/t5/GitHub-Pages/Can-I-have-a-Github-pages-Blog-where-any-user-can-post-on-to-my/m-p/16041
Since github pages are static you can’t create something like forum, you have to choose something else to do that. But you can create on github the repository of the forum and than connect to https://www.netlify.com/
I found this 2 year old post and I couldn’t figure out how to make a forum possible with netlify. Can you tell me how?