found a much more direct solution to my problem using paru.
thought this might be helpful to anyone looking to multistream to multiple platforms using OBS. use the following command to install the multistream plugin
paru -i obs-multi-rtmp
open the obs-multi-rtmp directory in terminal and run the following
makepkg -i
then open or restart OBS and there should be a panel that says "multiple output" that allows you to add multiple rtmp sources/sites to multistream to.