You have a truly fabulous deck. I would agree with the other posters that you should focus 100% on phono stage for upgrade, even though the Stellar was probably a recent purchase for you.
I’m partial to the VAC tube MM stages. Then add a good external SUT (Bob’s Devices Sky, EAR, etc), and you will never ever again feel your music is lacking an iota of: body, soul, musicality. There was a VAC Standard preamp with their excellent onboard 3-tube phono stage for sale here at about $2K, I believe (I have no association to the seller). I would get that JUST for the phono stage, even bypassing its line stage if you find your current one better. Then add a better external SUT. Or you could start with a nice warm fleshy sounding SUT (Bob’s Devices Sky) and add that to your Stella and see how you like that to start!
I’m partial to the VAC tube MM stages. Then add a good external SUT (Bob’s Devices Sky, EAR, etc), and you will never ever again feel your music is lacking an iota of: body, soul, musicality. There was a VAC Standard preamp with their excellent onboard 3-tube phono stage for sale here at about $2K, I believe (I have no association to the seller). I would get that JUST for the phono stage, even bypassing its line stage if you find your current one better. Then add a better external SUT. Or you could start with a nice warm fleshy sounding SUT (Bob’s Devices Sky) and add that to your Stella and see how you like that to start!