Well, I’ll say this- I constantly advocate for Ibanez when people are asking about a great cheap bass, specifically because I think their PJ pickup position and the pickups themselves on the cheap GSR line are absolutely fantastic and sound as good as any other bass I have.
looking into it, it seems these AFR are ceramic magnets.. now a lot of types of pick ups can sound a lot of different ways, but I haven’t run into too many ceramic pickups I liked the sound of.
so long story short I think you could easily get a fantastic sounding bass with even a modest pickup upgrade. As much as people love SD stuff, that’s a good start, or if you’re trying to blow a little more cash you could throw some nordstrands in it, which to me are about the best sounding PJ you were going to get without stepping into that super expensive tier above that.
edit- I will add a couple things …. First off, it is great advice to slap on some new strings, and adjust your set up if you haven’t… I find that my action is a huge influence on my tone, and a little less so is the pickup height itself..
play with those things and see the kind of range of tones you can get out of your electronics.
I will also add that Nordstrand is great for a modern vintage kinda sound.. which essentially means fat old school tone but with a little aggression and better clarity up top.
if you want more of that muted rounded dark chewy tone, Bartolini is the ticket, but I DO find they are best implemented with a Bart preamp as well. Not that the pickups sound bad by themselves or anything, it’s just sort of a well developed tonal ecosystem with them paired together.
as others said, there are a huge swath of options at various price points that will all sound great if you find that your current electronics are indeed not doing it for you.. it may simply be that you don’t care for the way the upper end sounds with ceramics
extra edit: I think most, if not all Bartolini’s are ceramic, but his engineering and taste are such that the high-end has this nice rounded dark-but-not-muddy sound, which is pretty starkly different from the Generalized “harsh“ top end, you will often see attributed to ceramic pickups.