Renunciation prayers are addressed to God and always said in the name of Jesus. They can be said for specific things such as prior involvement with the occult or witchcraft, in all its various forms such as New Age or freemasonry. A Google search will bring up some prayers and there are some on this site and Kanaan Ministries also have several good prayers.
Renunciation prayers can be particularly helpful for a new believer experiencing problems and in need of deliverance and not sure of so many things and not used to praying to God. Renunciation prayers only need to be read aloud once. (Although if necessary due to backsliding, etc. on occasion they can be repeated.)
There is no harm in saying a renunciation prayer if it doesn’t apply, so even if doubt we can feel confident to go ahead. Most would benefit from saying this prayer:
Persecution Live 