You’ve read a lot of theories in psychology. You have ideas of what makes people tick. It’s time to write your own theory of psychology!
Or you could start a bit smaller with your theory of personality. I wrote one. You can too. It’s just putting your thoughts down on paper. I’ll even help you.
Start with this video on what to include in Your Theory.
Bruch up on what other’s have said. Here’s a whole course, including videos, on Personality Theories.
And here is a copy of My Theory of Personality.