There tends to be a normal ebb and flow on this forum, as with others. Many broader Thailand questions are better handled in one of the other sub forums on ThaiVisa as they are not Chiang Rai specific. Many people are still around but perhaps focussed on another sub forum like news, sports, farming, photography or motor vehicles, etc.
Chiang Rai itself is quite small and easily navigated so most people find they run out of Chiang Rai specific questions press fast. Some of us try to start a conversation from time to time but we usually get interrupted by the trolls which ends up discouraging others from posting.
But to answer your question the forum may be quiet right now but it is far from dead as the members are still around and it is the members who make up the forum. As I often say, the forum is what we make it and it depends on the input of the members.