Where should I start upgrading?

Thank you for all suggestions.
Randy-11 good idea to have the turntable in another room but unfortunately not for me, the cab length will be overlooked. I have already done room treatments & moving speakers around.

Donvito101 Maybe a subwoofer that is bigger and faster is a good idea to borrow and listen to.

Zavato / williewonka I also think an upgrade cartridge will make the overdue difference since the MP-110 is a cheap product. It works well with a little extra weight on the cartridge shell. Is a bit hesitant about the DENON 103 cartridge as it is made for heavier tonarms

@Titus1 - my apologies - I assumed since you had the the Nagoka 110 whose complaince is 6.0 x 10-6 cm/dyne, that the Denon at 5.0 x 10-6cm/dyne would work.

You could try the Denon 301 with Compliance: 13x 10-6cm/dyne or the Dynavector 10x5 with a Compliance 12 x 10-6 cm/dyn

The Grado Sonata has a  compliance of 20 X 10-6 cm/Dyne

Being a big fan of Soundsmith - I would contact them to see which one of their own cartridges is best suited to your arm.

There are lots to choose from ...

Regards - Steve