I suspect what you’re looking for is:
1. The intimate small town feel of the early internet, and
2. The higher average post quality (because of the type of person that both had internet and used forums back then) as measured by intellectuality, domain specificity, and demonstrated expertise.
Reddit doesn’t display those qualities because of the tragedy of the commons phenomenon. Great content is interspersed with what is essentially “noob spam.” Even if it has a greater aggregate amount of quality content, it doesn’t have the same feel as older forums.
Reddit can try to fix this by grouping people together into social clusters. If there is a subreddit with 2 million people, why not create many smaller “breakout” groups that coexist with the main thread? Of course, this is easier said than done, but I’m sure it’s possible to execute this idea well.
I think VR meeting rooms will be the ultimate solution. They will be intimate by definition, and people will sort into their favorite social groups. An American scientist might join an international “scientist salon” and socialize with scientists everywhere from Germany to Japan. A bulletin would contain and display static text posts by the members of the salon. It would also display things like plebiscites and summaries of important meetings. You’d be able to bounce around different groups with a different subject matter any time you want. Some will have barriers to entry and identity verification, most won’t. Some groups will be purely social and defined more by the members than by any subject matter. Altogether that would make the internet feel more like a collection of physical spaces inhabited by communities of people.
What I’m describing ideally shouldn’t be run by one corporation like Facebook or Reddit. The communities should be strung together by a shared backbone under an Internet 3.0. Visiting one should be like visiting a different website. We can use the formation of the original 2D internet as a template for how to proceed in creating a VR internet.