Also check here for more breathing exercises: https://www.joyofsatan.org/www.angelfire.com/empire/serpentis666/Yogic_Breathing.html
And check this topic for new info on how to do the Breath of Fire at its strongest: https://ancient-forums.com/viewtopic.php?f=24&t=24687&p=109773
Note that in the above topic, when Mageson refers to the "sushumana activation point of the nose", he means the part at the bottom of your nose between your nostrils. That little "wall" that seperates the nostrils, basically.