Your "magick" doesn't "go down". There's no such thing. It's procrastination, laziness, and the feeling of being drained that leads to you assuming that your energy has been scarce.
It's better for you to cast spells on your own than someone to do it for you. Try meditation, cleansing your space (even cleaning it would do just as good), and doing things that make you happy. Drink lots of water; it cleanses you on the inside.
Hopefully these things will help you get back into casting. Try not to resort and depend on someone else to cast for you- especially someone you don't know.