Opinions sought: % contribution to sound by component — specifically cartridges

Hi, all!
I’m wondering if I can get some opinions on the contribution to sound of various components in an analog chain — assuming that all components are of a similar, highly-resolving/musical level; i.e., nothing out of balance.

Here is what is in my setup:

• Cartridge
• Tonearm
• Turntable
• Step-up transformer <> RIAA line stage [I’ll consider this one item — assuming appropriate gain for the output of one’s chosen cartridge]
• Amplifier
• Speakers

(Yes, I’ve left out interconnects, speaker cables, power cords, racks, room treatments, etc.)

The reason I ask is that I’ve built what I’ve felt is an exceptionally musical system over a 25+ year period that has withstood the test of time for me. The newest component is from ~2010. E.g., my amplifier is a Kondo-san-made / Audio Note Japan-branded Neiro Silver from the late 90s. I'm the original owner.

Some cartridges I’ve had in my setup include these LOMCs: XV-1s, Etna SL, Blue Magic Diamond. 

Due to some changes in life circumstances, my Etna SL is no longer singing as it once did, and I may not have the means to get a cartridge near this level. I’m trying to prepare myself for what I may be giving up, so I welcome comments on that as well.

Thanks for your thoughts!