It could be your body adjusting to the flow of energies from the ritual. The first few months I was using the Lbrp as part of my daily practice regiment i would feel drained for parts of the day. It’s like the after effects of a heavy workout routine your gonna be drained for a bit after.
Depending on how often you banish you may wanna shift a few days off in between to give your body a chance to recover energy.
Grounding meditations or exercises can help with this since it lets you tap into the earths energies naturally to recover. With the right the meditations and intent you can create a type of energy recycle circuit that sends your tired energies into the earth to be cleansed,empowered and then sent back to you in an effort to speed up recovery time.