You should start fresh...
format your sdcard to fat32
install atmosphere
go into rcm
push fusee-primary while holding buttons for maintenance mode
If you have done this correct, you will boot into maintenance mode. Do a factory reset, reboot and you should be good.
However, as you are told in every good tutorial, you surely made a backup before doing stupid things. Just restore that backup of 8.1.0 and you can try again.