It doesn't matter where you have already traveled, there are plenty of places to explore, you just have to do some budgeting, planning/researching, and enjoy your trip!
I consider myself a professional traveler. I have lived outside of the United States for about a half of a year. I have traveled to Europe, Canada, throughout the US, and the South Pacific. My preferences for places to travel are
1. areas with low population densities
2. warmer temperature, almost tropical locations.
There are so many reasons to travel. The first is to widen your life experiences. You can experience new sights, cultures, architecture, friends, etc.