Analog Upgrade - Where to start?

Your system specs look good to me. Based on what you said; “ looking for more dynamic sound, detail (without edge) and musicality.”, the first places I would look at are 1., the phono cartridges…there are so many newer models at various price points since your last cartridge purchase, that this one upgrade may itself solve your quest, 2., the phono stage…again, many options to play around with at various price points for phono preamps. 
Depending on your budget, the cartridge market is a free for all. There are plenty of below the 5k mark, and in between, 5-10k, it is another world, and then above 10k, more rare species of cartridges. If you like what Soundsmith did for you on the retip, at the just below 5k range, the Sussaro MKII is exemplary. 

Check out the new Acoustic Signature Neo turntable line or Dr. Feickert. Depending on the age of your tonearm...Kuzma has recently updated their tonearms with new bearings and other improvements. You may also want to explore cartridges from Ortofon, Hana, My Sonic Lab or other Soundsmith cartridges. Your phono stage has received many glowing reviews.

It seems to me that your phono pre is not on the same level with everything else in your phono chain.

with vinyl set-up can many times be maybe the easiest leap forward. if you are not expert on that, then if you know someone who can make sure you are hearing everything your present set-up can do that is a good place to start.

i do agree that your tt, arm, and cartridge are very high level; and would involve significant investments to push higher since your phono stage would mute the advances. your SME 20/2 is not held back by being from 2005. it can still deliver fine sound.

it’s hard to specifically recommend a phono pre without knowing the rest of your system and musical tastes. so i’ll just throw out the van den Hul Grail as a good very high performance phono that won’t break the bank and fits your stated goals. it plays with the big boys. there are many others to mention when we know more. do you prefer tubes or solid state?

https://www.vandenhul.com/product/the-grail-sb/

you can run across them used from time to time.

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!