A "bad tone" is only bad when it doesn't suit the ensemble or blend well. If it sounds good in the mix, it's not bad.
Just find something that you like, that people like, and that compliments the ensemble.
Usually by boosting the mid frequencies you gain more prominence. After that, you can mess with your tone as much as you want.
Definitely start twisting the knobs. Explore a bit. First explore within your bass pickups. Then explore within the amp. The bass pickups affect the source of tone whereas the amp frequency levels dictate how the sound is shaped. So, in essence, fiddle with your bass pickup levels, find what you like, then fiddle with the amp levels, then find what you like.