Use "in retrospect" at the beginning of your sentence to tell what you think of something after it happened. In the example above, you now think it's obvious that the publishing company wasn't honest, although at the time you were excited about it.
People use words like these along with "In retrospect":
probably (like in the example above)
In retrospect, I probably should have worked harder in school.
In retrospect, it seems like it all happened so quickly.
In retrospect, I realize that my parents were just trying to do what was best for me.
In retrospect, I wish I had kept working there for a few more years.
You can also use "in retrospect" at the end of a sentence:
I probably should have known it was a scam, in retrospect.