Deliverance is like taking out the spiritual garbage and getting rid of the rats that came with it. If you remove the rats but don’t take care of the garbage (root causes), then the rats will come back. Root causes often are addressed through prayer for inner healing.
Deliverance is like leading people into greater light. You can take someone quickly from the darkness of a cave to the light of a stadium, but it’ll hurt too much, they’ll want to go back, and ultimately it will be ineffective. In the same way, praying for deliverance is better done gradually. That’s when it’s more effective. Not everything you discern in someone is ready for deliverance/liberation.