If you have one website, it probably has multiple pages. The URLS mysite.com/our-services and mysite.com/blog/how-to-fix-anything are 2 pages from the same website. You can create improvement projects for up to 20 different pages per website each week.
A Starter Plan gets 20 page improvements each week that can turn into projects.
The Pro Plan gets 70 improvements each week. These are maximum counts that do not roll over if they go unused.
Agency plans are usually customized and do not follow these guidelines.