First of all, I recommend sincerity and humility.
hanging an amulet as a means (sabab) to cure an illness is major shirk, attributing a power or benefit to a creature that does not have that power is major shirk, in tawhid al uluhiyyah.
And do not invoke outside of Allah what neither benefits you nor harms you, because if you did, you would be one of the unjust. (quran 10:106).
consult book: Suleiman bin Sheikh Muhammad bin Abdul Wahhab - Clarification on the Unity of Creation in the Response of the People of Iraq pages 267 and 273.
kitab tawhid and fath al majid are books manipulated by the tagut.