It completely depends on the popularity of your Pressroom.
For press releases in a Pressroom to be seen by as many visitors as possible, you need to promote your Pressroom and press releases. The same rules apply here as when promoting articles in the media or a blog.
You should share links to any press releases and Pressroom through all available digital communication channels that you have access to. Examples include your website and/or a personal blog, social media accounts or you can link to it from articles on other websites that allow such.