Astral Projection can "break the silver cord" if done improperly -- the umbilicus spiritus that connects your physical body to the spiritual and inevitably cause your spirit to be in infinite Perdition loop
Ritual Magick opens you up to demons as others have said. You can use it for helpful ones just as much as harmful, but helpful ones are usually gins and take "a cut"
Helpful ones are 12 apostles and any saint and the main Archangels Michael, Gabriel, and Raphael
Bless your spirit that your silver cord isn't already broken.