Just imagine all the ones we cannot see because they are too far away and the light has red-shifted to below infra-red...................
Theoretically they don’t exist. The earliest light we can see is in microwaves, when galaxies weren’t even a gleam in the CMBR’s eye.
There is the theory that the fabric of space is expanding as well as the motion of objects. This causes everything that is far from us to appear to be moving away from us. And the farther away the faster everything is moving away which is what we observe for distant objects. The percentage of change in frequency change from gamma to infra red is huge, but from infra red to DC is really small. What we may be seeing is an event horizon where any light farther will never reach us because the accumulation of the expansion of space makes things move away at greater than the speed of light at the vast distance. So things shifted to IR or to radio frequencies may only be as far as we can see. There is no way to know if there is anything beyond that.