There is always a space to create other websites, blogs, forums ,etc - just buy some domains in different hosts and then use them to get higher your main website. Ofcourse you can do with those websites the same, what you are doing with your main website (add to directories, forums, etc).
It is always good to have more than just one website. The result will come, sooner or later. Just work hard and work every day to get backlinks.