+1 to trying new strings first.
I would recommend you set your amp's EQ flat (everything at the 12 o'clock position) and adjust it from there. It's common for people to boost the frequencies they want, but sometimes you can get a better result by cutting the other frequencies first. Play with that some.
From there, I would suggest you try out a couple preamp pedals. Personally, I never got the tone I wanted until I started using preamp pedals, even with basses with onboard preamps. They add a character to your tone that you really cannot replicate any other way (imo).
I would recommend you set your amp's EQ flat (everything at the 12 o'clock position) and adjust it from there. It's common for people to boost the frequencies they want, but sometimes you can get a better result by cutting the other frequencies first. Play with that some.
From there, I would suggest you try out a couple preamp pedals. Personally, I never got the tone I wanted until I started using preamp pedals, even with basses with onboard preamps. They add a character to your tone that you really cannot replicate any other way (imo).