Any good alternative to Raspberry for Arm64?

[bob prohaska]

If you already have the Pi4, boot it with RasPiOS and use
apt or apt-get  to bring the system up to date. That will
update the on-board firmware, which I gather was the sticking 
point for FreeBSD 

At that point I _think_ 
FreeBSD-14.0-CURRENT-arm64-aarch64-RPI-20210304-483c6da3a20-257149.img
will work. At least, it did for me.  

>From that point on the Pi4 has performed quite well. 

Good luck,

bob prohaska