My sense is that interest waxes and wanes over the course of years. Sometimes the user becomes re-inspired and comes back, sometimes not.
I have multiple stacks where I either have high current participation, or don't have time/inclination to think about. This usually ping pongs with my core areas of interest.
But you're on the right track that what we need to do is attract more qualified and earnest users. My suggestion:
- Post the Q&As you find most rewarding on social media
Encourage others to do this.
I'm not sure the wider AI community realizes what a great and reliable resource is Stack:AI. And I've looked at the quality of AI information on less rigorous forums and Q&A, such that, with certain exceptions cases, I stick to stack.
See also: List of exemplary questions on AI theory