Hmm 
it’s interesting that you’re experiencing a bit of energetic decline after doing the Lesser Banishing Ritual of the Pentagram. Normally, this ritual is one you only need to do once a day or so. It’s a banishing ritual, a sort of way to cleanse and protect a space all in one.
Were you doing this ritual many times at once? Or many times over the course of a few days or weeks? That could lead to burnout if you’re doing it too much, much more than should be done.
Many people are experiencing burnout lately with the way the pandemic was handled in places, the burdens of capitalism, and the trials of just existing in our society. I would suggest looking more into burnout and self-care practices and take a break from doing any energetic exercises.
We have several topics on burnout here on the forum, too. Those might be helpful to look through and see if it resonates with you at all.
- Spells or practices that can help with burnout
- https://forum.spells8.com/t/burn-out-battle-i-feel-i-am-falling-and-failing/26997
- How To Deal With Spiritual Burn Outs - #11 by Missa
- Feeling lost, displaced… - #2 by TheTravelWitch_Bry
- I'm Burned Out ║ How to fix it - YouTube
- Let's Discuss: Feeling Stuck or Burnt Out in Your Craft - YouTube