Focus group trouble

Hi, to whoever's reading this,

I've been trying to get my focus group(s) together for quite some time but don't have much of a platform presence to reach out to people who aren't my friends. Our product is very confidential so an ad of any kind wouldn't really help us, it would have to be vague if anything. Just wondering if anyones gone through this process before and had any tips on where/how to find focus group participants.