Some excellent suggestions here (vrcasting's post had great examples).
I will second the request for more girl on girl closeups. Not just classic 'Nash 69' from behind/underneath (which is fantastic), but also when one girl leans in from the front/side, looking us dead in the eyes while she licks. And have them spread each other wide. Like really wide.
More multi girl scenes in general really. It just adds so much to a scene when the girls have an active partner to bounce off of. Even if it means fewer monthly releases (more booking fees), it's worth it.
But I'd like to talk about casting...
There's a whole generation of talent from the early 2010's who just missed the VR boat (Tori Black, Lisa Ann, Asa Akira, etc...). Remi LaCroix recently came back for a VR scene, unfortunately the scene was terrible (bad director, bad framing, bad visual quality).
And that's where Alex Nash comes in... If you can convince any big name star (active or retired) to come back for one last VR scene, that would be HUGE.
When Spielberg calls, actors listen. Knowing that they would be working with one of the top directors in the industry may make them more likely to sign on.
Let them know it could even be a solo/simulated sex scene (not ideal, but time is running out, we need to take what we can get). The male talent is invisible in many positions anyway (closeup mish, seated upright cowgirl, the bed laying segments with kissing/spitting/toying/cunnilingus, etc...).
And most importantly, sell them on the idea of being immortalized in VR (before age robs them of the opportunity).
When you combine an experienced (and beloved) star with a director who knows how to frame tight/intimate shots, you have a recipe for something special.