Where should I go from here with my digital front end?

Go here, several folks here have taken my advice and are quite pleased with the results.  Get the fiber in what ever length you require.  EMI and RF will not travel down fiber and I recommend using the fiber on your longest run and terminate with a HQ CAT 8 cable.  Crystal clear!

 

What is the rest of your equipment? There is a place to show under your UserID. This gives a much better perspective. Cables are very component and system dependent. Typically one wants to stay in a cost range given your overall component sound quality. But the guidelines are really flexible because of system differences.
 

If your other equipment supports higher quality sound upgrade your streamer. If your other equipment supports it you will get a very significant increase in sound quality by upgrading to a, for instance… recommended, Aurender at the $5K, $10K, and $20K component range.

OP stated he had $1k budget. Best results for that budget would be either fiber conversion or Eno filter if staying with ethernet. The good thing about going this route is both remain effective even as rest of streaming setup improved.

Thank you all for your input. So the rest of my system compromises of: Audio Mirror Tubadour 3, Belles Aria Signature Integrated, Audio Physic Tempo Plus. All power cables by Triode Wire labs. Digital and IC are Wywires Platinum. Silversmith Audio Fidelium speak cables. Puritan 156 power conditioner. Going fiber? Relatively Inexpensive and with Amazon's easy return policy no reason not to try. Just so I understand, I still use my Supra Cat cable to connect from my eero mesh into to 10Gtek converter. From there I connect the optical cable to another 10gtek converter and finally another Cat Cable to my Lumin streamer?

Yep, you have correct connection protocol. If going fiber route do linear power supply for at least last FMC, lps for both best. Also may want to consider moving to Sonore OpticalModule and OpticalRendu vs the generic, well worth the premium. I'd estimate your setup will expose the improvement.