Just as you, a lot of people stopped playing CS.
People grew older, they have more responsibilities, less time for games + CS 1.6 has barely any player base at all right now.
The ones who still play transitioned to other games like CS:GO, where getting a solid player base in the servers that registers in forums is basically very difficult.
You combine this with the current popularity of Discord, community forums are not a thing.
TL;DR. the previous members grew older and are barely playing anymore (including me), CS 1.6 is dead, community forums are no longer attractive.