Assuming you use pulseaudio and the suggestions there are good, then the same.
But it seems to be from 2017.
~/.config/mpv/mpv.conf
https://wiki.archlinux.org/title/Mpv
Are there any others you want? Or that are provided?
Or ? …
In general “do this standard thing and it makes things better in every case” are rarely accurate. Especially for something so dynamic and subjective as audio.
Easyeffects and such has arch wiki info:
https://wiki.archlinux.org/title/PipeWire#EasyEffects
(but easyeffects is pipewire … as is that link you shared)
Theres at least one other “this makes sound better” thread on here: