Suggestions? Well, that is hard one. How would you improve upvoting of your participants? That would be your goal.
Logically you could start thinking from making a rule that every participant need to upvote other comments by some small percent like 10%, 20%, etc.
OK would be an idea, but much work to check this all.
I cannot see at hive.blog with what voting-power a comment was voted.
So I prefer to reach this with attractive cards and not by rules.
The last three cards are more than 1 USD worth each, I think all three together more than 5 USD, so I think it will be even a good deal if you upvote 10 comments with 0.03 USD, so everybody of this 10 would get a payout, to get the card.
For example you can see link to this comment
https://peakd.com/splinterlands/@dexy50/re-wer-gewinnt-qdj764
And in browser address bar you replace its peakd.com part (in your case hive.blog part) with hiveblocks.com and you get
https://hiveblocks.com/splinterlands/@dexy50/re-wer-gewinnt-qdj764
There you find all about payout and voting.
ok let's keep this in mind, but I want first reach this without to strict rules - let's see how it work first ...