"Rock/metal, jazz and country" pretty much translates as "I want to play anything I like on this bass", which is as it should be.
In my experience, going to a show is completely futile if you want to try instruments properly, and trying lots of basses in a shop achieves nothing except confusion unless you know exactly what you're looking for.
Big changes won't help you either. Switching between, say, Hofner and Warwick will teach you very little.
What bass have you been playing as a beginner?