I can't speak from first-hand experience but have you considered various mods out there for Regas?
GROOVETRACER® SUBPLATTER
as an example perhaps in combination with tonearm+isolation-feet+mat upgrade from Funk Firm, all which together, at least based on online reviews will give you sound quality at multiples of the upgrade cost.. just a suggestion.
Upgrade cartridge or turntable?
I have a Rega Planar 3 turntable with an Ortofon Blue cartridge which has served me well. I’ve had them both now for two years and am around the 1000 hr mark which in itself draws debate. I’m looking for opinions on either a cartridge upgrade, or a turntable. Can go to 2000 for TT, also considering MC cartridge which would involve a new phonostage. Let’s hear it.