There are other kinds of enslavement issues that can control us. Many mindsets keep us locked into self and life defeating behavior. You can be a slave to the thought " this is the way we have always done it". One thing Bill Johnson talks about is being a person of learning , will cause you growth and a learned person will be the master of an extinct world.
Often we get into routines of times and ways of doing things. God brakes in with a task and we say sorry that doesn't fit into my way of doing life so that can't be you God. Now I am enslaved to my way of doing things.
I know people who don't enjoy vacations because they can't get life their way in other place.
My point is sometimes we enslave our selves more than anyone or thing does. We are only free when we can be joyful where ever we are what ever task we are doing.
You could be a slave to your own low self concept. Have you ever had God ask you to take on a task that you said "I can't do that I am not qualified or not smart enough? It happens to me often. Some of these things I go ahead and take a step in that direction and then things unfold and His grace takes over. There is still one thing that has been set before me for 30 years I have not done because I can't see me doing it. I have been a prisoner of my own thought of myself.
Today I confessed this area of my life to my best friend. Some how that broke the bondage I was in . I am free today to take the steps forward into what God has for me. I still don't have the big picture but I have a new joy to take this first step.
Be Free People.