Community rewards are truly unpredictable

I wrote a long post, but let's all have a great day today!! My activity level is pretty much the same every day, but my rewards suddenly plummeted around 8,000 gems..ㅠㅠ I kept getting slightly fewer gems even with similar activity, so I had given up hope, but yesterday they suddenly shot up. I thought they might crash again, so I didn't think much of it, but now that they've risen again, I'm scared about how much they'll drop. Nothing has changed from my usual routine, so why are they fluctuating so wildly on their own? I'm happy they went up, but without a reason, I can't really look forward to it... They say an AI makes the decisions, but they don't tell us anything. I wish they'd at least give us a scoring rubric. Or at least clear criteria? As I'm writing this, I suddenly thought, maybe they don't tell us because it would make everyone's posts too formulaic.