For the level of gear you have, consider spending $400 for a Soundsmith Otello moving iron cart.
It will be compatible with your existing phonostage and give you a taste of what nicer cartridges can do- MM or MC.
I wouldn't spend much on a cart until you drop considerably more money on a phonostage and everything else in your setup.
https://www.sound-smith.com/cartridges/fixed-coil/otello
I keep one as a backup for my $2K LOMC.