If you would like to upgrade from one cartridge to another then maybe you would like to hear something different from what you already have.
Put your Danish Ortofon against some serious Japanese MM cartridges such as AT-ML series from the 70s/80s (mid compliance), Grace F-9 series from the late 70s (high compliance), Victor X-1IIe (mid compliance) .. they are all under $500 or close. Terrific cartrisdges!
Grado signature XTZ (MI) will kill it IMO
High compliance AT20SLa
Limited Editoon (with Nude Shibata) is the champ when it comes to $500 budget.
The rest is depends on your tonearm and phono stage.