Feeling stuck with 30users/week growth. How do I increase this significantly ?

I'd think of this as a funnel. Is the leak at the bottom, and you're seeing people drop off the platform or stop using it at the same rate people are coming in? Do people post a couple times then stop completely? Or is the problem sign-ups? Or is it simply exposure, and not enough people are seeing it?

Do you have any metrics around to help answer these questions? Here's the ones I think would be important:

• % of new users who create an account
• % of users with account who do the core thing (make a post?)
• % of unengaged / inactive users

Also, likely next steps based on the problem:

• If the problem is that visitors rarely make an account, I would have conversations with customers who recently made an account, and ask what encouraged them to sign up
• If the problem is that users who make an account don't do the core thing, I would reach out both to users who have and users who haven't and see what characteristics distinguish the two.
• If the problem is that people stop engaging, I would reach out to those users and find out why they stop engaging.

Basically, the best solution is to talk to users who are not doing what you expect to see what's wrong, or talk to users who ARE doing what you expect and see what's right. Do you have the systems in place to do this?