Using Bat file to change episode folder files

Hi all. So I have create a .bat file and it works flawlessly when all episode files are together. It only keeps audio 1, removes all subtitles and title names. However on my NAS the file structure is Season Folder > Individual Episode folders. Is there any way this script can be modified so I can place it in the season folder and it will change the MKV’s in all the individual episode folders? Otherwise it will be a lot of work putting all the MKV’s back into one folder and then back into their individual folders afterwards.

Buffy > Season 1 > Episode One > Episode one.mkv
Buffy > Season 1 > Episode Two > Episode two.mkv
Buffy > Specials > Buffy the Movie > Buffy the Movie.mkv

I’m a complete newbie to any kind of code so apologies if its rough, or you have to explain like I’m 10 years old lol. Here is my .bat file, if someone could modify it to do the mkv’s in the subfolders I’d be really grateful!

FOR /F “delims=*” %%A IN (‘dir /b *.MKV’) DO “C:\Program Files\MKVToolNix\mkvmerge.exe” -o “fixed_%%A” -a !2,3,4,5 -S -T --no-chapters --track-name 0: --track-name 1: --title “” --compression -1:none “%%A”