i play bass in a band with three of my best friends, i absolutely love playing with them untill recently, i got really frustrated with my bass playing. i feel like i've gotten stuck at the level i'm at, i can learn most songs without any major problems but i feel like i lack skill in improvisation and there arent any teachers in my town. I also think my bandmates do not appreciate the awesome sound of the bass, they say that the drum and guitar are more important, while in my opinion the drum and the bass are the foundation on which the guitar has to play. do you have any tips how i should make this clear to my bandmates and on how i could improve my improvisation? 