Normally I would get a shorty barlow (2x). Orion has a nice one that works well. Also, Orion has the basic color filter set. These color filters have many uses such as (blue, darkens the seas on the moon and green will futher enhance the polar ice caps on Mars, and so on). The polarizer is great for the moon and I also found out it works well when I couple my digital camera to the telescope to have "moon vision" and cuts the glare on moon and bright planets. Love it. A lunar filter AND a polarizer also works well togehter, especially for those full moons. Try a shorty barlow. With the 2 eyepiece you have you can double or "triple" your assortment.
A barlow installed behind the diagonal is 2x, a barlow installed before the diagonal is 3x. Try a barlow. It's what I consider part of the standard equipment. Good Luck!!