how if our sound djembe not good

Check the drum head tension: If it’s too loose or too tight, it can affect the sound.
Make sure the drum is in good condition: check for cracks or warping.
Try different playing techniques: striking the center, rim, or different parts of the head can produce different sounds.
Experiment with hand positioning: try different hand positions and pressure for different tones.
Use a different drumming surface: playing on a carpet or towel can affect the sound.
Consult with a professional drummer or percussionist.