you (probably) won’t break your system just by trying out a new kernel…and even if that happens we are here to help you out. a recent update made it so that sound doesn’t work on kernel 5.15 lts which is the default on many manjaro installation.
you can go to manjaro settings manager and install kernel 6 through a gui → reboot → press ESC and switch to it. if this doesn’t work share the output of inxi -Fazy.