Hello. I believe cactus farms were nerfed. I experienced the same thing in where I build the first story, and it was generating decently, but after the second story production stopped to averaging maybe 1 block every 5 seconds... I would recommend looking into Sugar Cane and Bamboo farms
I think cactus farms were made weaker. Similarly, when I built the first story, it generated nicely; but, once I built the second story, production ceased, and I would only get one block per five seconds at most. escape road
It does seem like cactus farming isn’t as reliable as before, probably due to recent changes. Red sand might help a bit, but switching to sugar cane or bamboo farms could be a better option since they grow faster and more consistently now.