Advice on what’s next?
stringreen suggested “just enjoy.” That’s the right answer for this question almost every time. If you’re pretty interested in an upgrade that will add to the enjoyment with the greatest bang for the buck, that’s where the interesting part starts.
I’m sure that I’ve moved through equipment in the last decade, sometimes without fully hearing what an individual piece was ultimately capable of offering. If it were my system, I might try a different speaker cable, just to find out whether I can hear that fine of a difference.
Or I might try a different pair of speakers, as in that case I should definitely be able to hear a difference. This might also be true with a phono pre, but imo this would be easier to hear once the speakers were swapped out.