I'm sure the man page for gpg can tell you the command line incantation, but I use https://gpgtools.org/ https://gpgtools.org/ for mac which just has "make key"

I'm sure the man page for gpg can tell you the command line incantation, but I use https://gpgtools.org/ https://gpgtools.org/ for mac which just has "make key" and "revoke key" buttons. The tricky bit is just to get your friends to sign your new one, you'll have to re-do all of that work