Sorry if this is a little rambling and disjointed, I'm coming off a med that's somewhat affecting my thought process so bear with me if ya can:
For what it's worth, my experience has been that the cart makes a far bigger difference than the TT. In fact, my general experience is that as you move up with TT's, what you're primarily gaining is more adjustment points and therefore potentially better sound quality, but it takes a lot more setup work and tools to get there.
I'm probably simplifying things, but my philosophy has been there's probably 5 or 6 steps that get you 98.7% (a highly scientific number I arrived at after DECADES of careful study ) of the way to an excellent setup, and then about 100 more to get to the last 1.3% of "perfection". I'm ok with stopping at 98.7%.
On quality low end TT's (Yamaha, Luxman, Pioneer, etc) without adjustment beyond overhang and cartridge alignment, I've found that typically the only "out of spec" setting is SRA/VTA due to a non-height adjustable tonearm (you can probably get close with washers/shims). The rest can usually be dialed in and is frankly often easier on cheaper TT's with less points of adjustment to worry about.
confirm that your current cartridge is the AT-VM95E (or older AT95E?) and think about where you want the sound to go from there. If you have the AT-VM95E, a simple stylus upgrade may satisfy your cravings.
If it is the VM95 you've got 7? stylus to choose from, including a micro line and shibata I believe. The VM stylus fit all VM series carts, so while you could upgrade a 530, 540, etc. I think you'll get 95% of the benefit of an upgraded cart going with a higher end stylus and, maybe even more importantly, doing a careful (doesn't have to be molecular nerdery level in my opinion) setup of the cart/stylus.
If you're after an entirely different listening experience it's not a bad idea to invest in a second cart to figure out what you like. I used to sell high end bicycles and I always encouraged people to try as many as they could because they all feel different (despite being basically the same) and you often know right away when you've found "the one".
Hope there's something helpful in here for ya, sorry if I went a little long and OT.