>>440781There's no "hub" of v-tubers that you can just access and request everyone play your game, if that's what you're asking. If there's any sort of congregation like that, it's in-house and between the chuubas, not open for viewers like us.
Your best bet would be to shill your game in /wvt/, as there's a few indie chuubas that hang out around there. Otherwise, you're going to need to get out the elbow grease and solicit people individually.