I also see it that way. Remember how ChipMixer was simply the number one mixer everyone used? They spent quite some money here, but I would say it paid off (for the time they were up running). If I needed a mixer, the first thing in my mind would be "ChipMixer", and their signature campaign was the main reason.
It's good to hear that a bitcoin related campaign actually led to the usage of the product by bitcoiners.
That's a bit the point. When a product is correctly advertised, it will have a predictable return, in the short or medium term.
Now, perhaps we need to increase the quality of posts and topics, to attract more users and new content. In this field, I believe we can all improve.
Make the forum even more popular, outside the forum. This could help attract more potential advertisers.