Perhaps Similar Worlds can implement a point system or one akin to it to incentivize engagement.

You get coins for posts/comments so I suppose they already have one in place

Most incomers say "hi" first.

OMG. Let's also have parent conferences to keep parents or guardians informed about the progress of their little posters. And, maybe parchment certificates of achievement (suitable for framing) could be handed out, maybe quarterly(?) to recognize posters who reach engagement thresholds.

Note: "Icon medals" are already applied to accounts for reaching milestone comment numbers.

They already do. They call it "reputation rating" or some such. Admin have mentioned it.

"Incentivize"?

Alternatively.....

Coins are basically the point system.

And what would those points be used for?

thats what coins are supposed to do