There's a lot of things #ArchLinux gets right, but a friendly configuration of #bluetooth is not one of them.
I did invest a lot of time connecting an USB speaker (#SoundCore2) , and an equal amount of time enabling the computer to send the sound through them. Why 2 steps? I'm afraid I can't answer that in a single post.
It's probably relevant to mention I've working (professionally) with #linux machines for about 20+ years now.
This is the only resource you need, BTW: https://wiki.archlinux.org/title/Bluetooth