This approach didn't work for Slashdot, Digg and Reddit, which are all fallen civilisations. If we don't try anything new to solve the problem, this civilisation will fall as well.

Reddit actually has extremely high quality subreddits - it is just the main tags that have degraded.

Reddit's front page look like neon lights of a cheap brothel, how can we know there is a great experience waiting for us in a dark room?

Because it's as easy as going to a subreddit (r/linguistics is pretty interesting). It's a free and open website: the barrier to entry is practically non-existent.