There's an obligation upon the person who's set free from demonic oppression. It is ... GET INTO THE WORD OF GOD, and SURROUND YOURSELF with other Christians who believe this, know it, and do it.
If you don't do these things after you've been delivered from demonic oppression, you will be worse off than before your deliverance.
Matthew 12:43-45 ... When an unclean spirit goes out of a man, he goes through dry places, seeking rest and finds none. Then he says, "I will return to my house from which I came." And when he comes back, he finds it empty, swept, and put in order. Then he goes [back out] and brings back with him seven other spirits more wicked than himself, and they enter and dwell there ... and the last state of that man is worse than it was at the first.
Reverend Robert W. & Mary C. Butler