There are many great sites out there. People may think they are dead or lost because they don't attract millions of view per day, but "back when the web was good" there were just less people on the internet. And a lot of the bulk of the people online padding out the numbers these days are never going to be interested in these sorts of things anyway.
To find new sites it can be fun following a topic down a wikipedia rabbit hole looking for external links etc. for example start with discord on wikipedia and eventually end up with something like http://www.principiadiscordia.com fnord