Welcome at the forum @shane1 
To better understand your issue, please provide some more information about your system, a start could be to post output of
inxi -Fza
dmesg | grep firmware
Also, please tell us if you have only Manjaro installed or other OS in parallel.
You said you tried already a couple of things: Please tell us what exactly, ideally in combination with the commands and messages.
Last but not least, it’s worth to study the wiki in parallel:
https://wiki.archlinux.org/title/Network_configuration/Wireless
Have you tried what is described here already:
https://unix.stackexchange.com/questions/723828/mt7921e-00000900-0-hardware-init-failed