If you want to make a dramatic improvement in your playing, a drum lesson is vital. This goes for drummers of any type. Whether you play a drum set, hand drums, marching drums, percussion, and so on.
To be honest, you're getting short changed if you focus on just one area of drumming. They're ALL related, and share common threads. A drum lesson can help with areas your comfortable with AND introduce you instruments and techniques that you may not have learned about otherwise.
The BIG Question is: "How Do I Get Drum Lessons?". Easier than you might think. You simply have to decide which route you want to take. A lesson can be obtained in several ways: