Over time, some Echo devices become deaf. In my opinion this is probably due to dust, grease, hair spray, or whatever else is in the air. Most electronics run warm, so warm airs rises through the ventilation holes on top and draws cool air from other places such as the holes where the mics are. As air moves through the holes, tiny amounts of dust, grease, whatever else attach themselves to the mics. Over several years, your Echo becomes deaf.
To illustrate, I have an Echo Show 5 in my kitchen. It's about 8 ft away from the stove. Just by touching its screen, I could feel a sticky film over it. I assume that the same sticky film got into the mics as well. Of all of my Echo devices, that particular Echo Show 5 is the most hard of hearing. I could be speaking 5 ft away from it in the kitchen and the Echo Dot 15 ft behind me in the living room would answer.
I don't know of a good way to clean grease off the mics without damaging it. So when you are completely fed up with it, that's the time to replace it.
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