I have noticed several members migrating from Manjaro ARM to other distributions supporting ARM (search the forum and you will likely find related topics).
I recall seeing Debian and EndeavourOS, and Arch Linux itself, mentioned as having better support for ARM than Manjaro. @tartanpion has also written a HowTo for migrating to Arch for Pi5:
The following article might also be of interest. However, please, perform your own research to gain a more accurate understanding of the situation.
Related: