what is the point of this post? if you really wanted guidance as to where that money is best spent, its obvious this post has failed you. just go and read some posts and research for yourself as to where it may be best spent. you have provided nothing to us about what your niche is or how that money was made (autoblog?Clist?ebay?article?youtube?) we wound't know how to help you even if we wanted to.
since, only you know the details of your method, only you can know which marketing vehicles will work....