Microphone kit. Fascinating. Whip out your soldering station and go to town.
Make sure and get the electrolytics the right way 'round.
Its insanely hard not making any noise for any length of time.
Right? Nobody has any real feel for environment noise being 1000 times quieter than your voice (-60dB). Or better.
OK, now read a book. Can’t take you any more than a month or so.
I’m at home and I still can’t find anything wrong.
Just for form, we publish a rating tool called ACX Check.

https://wiki.audacityteam.org/wiki/Nyquist_Analyze_Plug-ins#ACX_Check
And a mastering suite of tools.
https://wiki.audacityteam.org/wiki/Audiobook_Mastering
Oddly, you having a ballsy male voice might have trouble with the equalizer step. It’s a rumble filter and you may have voice tones in the range. It may try to remove one of your…features.
The suite is only three tools and you may be one of those unicorns that doesn’t need it.

This is how to submit a test to ACX. This is a cleaned up forum post.
https://forum.audacityteam.org/t/how-to-send-a-test-to-acx/49588/1
And you probably already know most of the submission standards.
https://www.acx.com/help/acx-audio-submission-requirements/201456300
There is a file management plan. Export each raw reading in WAV 16-bit 44100 and edit a copy or a saved Project.
Export the Edit Master as WAV, and then convert to MP3 for submission to ACX. Do Not use MP3 anywhere else. It’s a very new-user error to announce, edit and submit one single file all the way through. These people are seriously dead if Something Goes Wrong and takes out that one file. The Edit Master becomes your Archive Master and you can save any of the other parts you want. I still have Raw Shoots from years ago. “Say Koz, do you still have that conference room shoot we did with John-Mark?”
Of course.
In my opinion you don’t need us any more. Good luck. Post back when you get your first contract.
Koz