The links to your sound samples say “Error 403 Forbidden”.
Possibly the WAV is mid/side rather than right/left.
There is an Audacity-specific mid-side decoder plugin …
https://forum.audacityteam.org/t/mid-side-decoding/34338/4
Alternatively, a simple solution: split the stereo track to two mono tracks & delete the left (the upper) track
Then you will only have the centre track as a mono, (not stereo), recording, (i.e. stereo is sacrificed in this simple method).
Abandoning the side channel is the easiest way to eliminate the abnormal wide stereo-effect …
This will also reduce, but won’t completely remove, the reverb(eration) from the room.
[There are de-reverb plugin$, but IMO they are only of use in mild cases, and are expensive].
Most of the reverb is in the bass frequencies, so cutting the bass will reduce the reverb
https://manual.audacityteam.org/man/bass_and_treble.html
Apparently 2 mics: one top, one bottom …
If one end pointed towards you that will be middle, the other mic side.
For audiobooks one mic is usual, (IMO just delete the side channel).
Your recording space is resonant / reverberant. 
Treating the space/ surfaces with sound absorbing material is better that trying to fix it in Audacity.