Mountain River Hiss. Best way to remove?

Wow. The info in this post changes everything for me.
https://forum.audacityteam.org/t/recording-in-mono-severely-limits-the-waveform-why/54376/3

I think I could even say the problem is resolved. The hiss seems negligible and when I do the noise reduction I’m very happy with the results.

If anyone could listen to this test and offer any other suggestions, such as a better way to remove any remaining noise that would be great.

I did have a question though about the info in this post:https://forum.audacityteam.org/t/recording-in-mono-severely-limits-the-waveform-why/54376/3

Following those instructions, I record in stereo, then I split the tracks, move the track with audio in it to pan center and delete the other track. Is there some setting I should change to avoid those steps? I’d even be content if there was a way to get a macro to do it.

Windows 10 Home
Audacity 2.3.2

Thank you so much! This is a huge help.