In addition to suggestions already made, I would like to add two:
-The book Magickal Protection by Damon Brand. If you get this one, I would suggest concurrently utilising the Remove Curse ritual and Master protection ritual (both are 33 days). I would also suggest adopting the twice daily Sword Banishing ritual (once you get used to it, you can do it in like 12-15 seconds).
-Luna. Luna is a servitor designed to see of parasites and unwanted energies in your space. She was created for the forum by one of its members and can be found here. Safe Servitor for beginners, banishing, protection, shielding and warding - Spirits, Evocation & Possession - Become A Living God