Siri uses the front microphone.
You have more than likely damaged the front microphone that is attached to the front camera, replacing the front camera flex should solve this issue.
Also check to see if your front camera flex is installed properly.
As Kerry has mentioned, some of the adhesive on the ear speaker mesh can be misaligned, this tends to be with the cheaper screens, the microphone hole on the adhesive is in the middle, but this is incorrect, if you look at the mic on the front camera flex, it needs to be slightly to the right, the easiest solution to this is to make the hole slightly bigger using something sharp like tweezers to tear it a little, this can help solve your issue if the microphone itself is fine.
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