Here is a common question.
How do we get members to join a community where there is no activity?
Building up a group of 50 founding members works well. You can do this by interviewing 50 members of your target audience for research and inviting them to join the community at the end of the interview.
Another way is to have your employees/team join and participate in the community.
No, don't pretend to be someone else, nor have fake discussions. Genuinely join the community and talk about the topic. Be honest, sincere, and engage in an open way.
Some people worry what members think if they see employees participating in the community. I worry about what members think if the organization's employees aren't participating in the community.
Besides, if you can't get your employees to participate in the community, what chance have you of getting your customers to participate?