Time.
It's a wonder how a bass can change through time, if you stick with one long enough.
With time, if you practice long enough, you get better and the bass sounds better. And the bass also gifts you with several happy surprises on the way.
Personally, when I got the bass, the only thing it needed was a setup (truss rod related), but otherwise, I had to get used to it - how to play, my fingers complained it was a murder and I seriously doubted that I would ever reach the frets needed and getting off-rhythm drove me up the wall. And that Pinky Hell, when I discovered that my pinky finger was needed to play some songs right.
I had to learn how to wire the setup and how to dial in to hear the bass through headphones and so on, especially when I use hearing aids and I had to invest in a good pair of headphones (currently AKG K712). Computer didn't really deal well with drivers used, so this was next learning experience.
It was a revelation to get the sounds working as I want then, even if at the beginning, only passive side got through, but after a whimsical change of battery, I am now happy to experiment with active sounds, which adds a whole another dimension to already played and learned songs. I am looking forward to discovering what else the bass can do when I will get better at playing it.