The furthest observable galaxy by JWST has a z number of 14.32 and the CMB a Z number of about 1089. If light loses energy and has wavelength lengthening in a gravitational field proportional to the distance traveled, The CMB wavelength 1900 microns would be on average a little over 2E6  further away than the farthest observable galaxy. The JWST has an infrared detection system of 0.6 to 28 microns. What if space telescopes were developed with deep infrared detectors at 50 100 200, 400, 800, 1600 micron wavelength  that could detect photons with lower and lower energies? A telescope with an 800 micron wavelength detector might have to be focused on  a specific location for 1-10 years (maybe that’s technically impossible)to collect enough photons – with the photon field from  500Z distant galaxies being reduced by the inverse square with the doubling of distances.
Deep AI retrieved this information about one far infrared telescope. The Herschel Space Telescope was a deep infrared telescope that operated at about 60- 670 microns from 2009 to 2013 at about 750,000 to 1.1 million miles earth orbit when it depleted its liquid helium. 
Recently (April 2025) data from the 2009-2013 Herschel Space Telescope was computer reanalyzed showing new more distant galaxies.

The final SPIRE Dark Field image map created by combining the Blue (250 micrometers), Green (350 micrometers) and Red (500 micrometers) SPIRE camera channels together, each channel stacking a total of 141 individual images on top of each other. The blobs on the image are all individual galaxies or groups of galaxies. However, the image is so crowded that there is almost no empty space with the faintest galaxies merging into the background light in the map. (Chris Pearson et al., Monthly Notices of the Royal Astronomical Society, 2025)
 

With both narrower range and longer wavelength far infrared detectors it might be possible to discover more distant galaxies at specified wavelength distances … up to the current cosmological limit of the CMB where the steady state infinite universe has an average temp of 2.7K consistent with the CMB 1.9 mm or 1900 micron wavelength.