Im currently figuring this out myself. So far Ive been trying to establish presence on HN and Reddit but it's really tough as a new user. I think that as you begin to gain credibility in these spaces, it gets easier to get exposure because you're actually seen as a real user. Just my two cents.
It's been brutal honestly. Cold calling ops directors in Canada and getting routed to HR every single time. The credibility chicken and egg is real, no one talks to you without proof you exist, but you can't build proof without talking to people