Annabella,
You can still create a some buzz online by posting your press release, joining social niche networks that reach who you are trying to reach. If you have a site up already, there's no reason why you cannot approach media now about it. You can also start networking with online writers/bloggers who also reach your target audience.
Don't put this on hold until you reach 200 members, start promoting it now!
All the best,
Nic
Nic Soto is an internet PR marketing specialist at Public Relations Depot, a Press Release Media Distribution company. Nic has been an online entrepreneur for over ten years, and business owner for over 20 years. Her areas of expertise is Public Relations (Digital PR), Branding and Organic Search Engine Optimization.