I also want to second this article:
(Forum says the lovely Keteriya has shared this already, but I have skimmed this thread 12 times and don’t see it, so I’m going to share it anyway.)
The banishing only gets you so far, you’ll need to do some work to keep them away, and ^this^ tutorial is a good read for that. I reference it frequently in discussion.
Shameless Self-Promotion of some of my other Posts on Similar Topics (Click to Expand)
https://forum.becomealivinggod.com/t/spell-series-hex-removal-workings/96842
I have shared some experiences on the dangers of magic/parasites:
A Personal Account of Parasites and My Own Ineptitude in Magic