If you're still taking suggestions for comms, I just ran down memory lane looking at old comms and I'll throw these in for consideration:
https://10variations.livejournal.com
https://lanieveria.livejournal.com <- multimaker comm with different activities for the makers. I'd always wished I could've participated because the themes were amazing!
https://pixelheroes.livejournal.com <- similar MMC idea here too
https://tasteislife.livejournal.com/tag/%21maker%20activities <- similar MMC idea here too
https://sortedchallenge.livejournal.com (HiH as a whole is closing down soon, but this sub-comm has been closed for a while)
https://elitesimplicity.livejournal.com
https://animan.livejournal.com
https://hogwartslims.livejournal.com
https://shinigami-lims.livejournal.com
https://am-rumble.livejournal.com
https://100x100mystery.livejournal.com
https://20inspirations.livejournal.com
https://iconsomething.livejournal.com
https://inspired20in20.livejournal.com
https://theskilltester.livejournal.com
https://rumblr.livejournal.com
https://theseasonwheel.livejournal.com
https://technique20in20.livejournal.com
https://movieslims.livejournal.com
https://oddlyspecificon.livejournal.com