There is no such thing as an ideal job! That is why it is called work! And that is why you are paid to be at said job!
However, if at this point in time you are underemployed, there are a number of things to do to get you back to the level where you are used to performing. With the drop in the national economy in the last few years, many people have taken jobs below their level of expertise.
Here are some ideas to bring you back to where you were before:
Volunteer to help on additional projects within the organization
1. Ask for a promotion when an opportunity above you becomes available
2. Utilize temporary work as a solution to become known within a company and then meet the decision makers who will ultimately hire you, likely in a more appropriate area for your skill set
3. Return to school. Now may be a great time to complete that college or advanced degree you have been waiting for