You have lots of Trigger, gate and modulation control there.
For your next 84hp, Ya'no before you up-scale to 104hp and 2 rows ;-)
Some good old fashioned VCA's or simple passive attenuators would be good, add a filter module that will react to Pinging as pings and sweeps are good. VCA-wise you could grab something like a https://www.modulargrid.net/e/future-sound-systems-p-o-c-a-vac1 as it's passive so draws no power and will give you CV-able VCA's.
Grab an Error Instruments Indian Resonator, its got a whole swathe of ambient clicky warbling goodness in it, a great design element.
Make Noise Mimeophon is lots of fun, hopefully one of my next purchases will be a Morphagene, though also tempted by the 2HP Loop.
I thought 84hp would be all I ever needed hahahahahahahahahahahaaaaaaa Enjoy the ride.
Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.