Cliché is something that is overused and unoriginal. It is used as an adjective. "Baby you are my world." "Urgh that is so cliché" (i.e. urgh that is so overused/unoriginal.) "My friend had a traditional wedding and then went to honeymoon in Venice." "That is so cliché."

I'm sorry, but "unless you change your cliché you will be in trouble" does not make any sense to me (U.S. native speaker). Here are some examples of correct use of the word cliché: "Every politician says they will eliminate 'waste, fraud, and abuse.' The phrase has become a cliché. Nobody ever says they will eliminate 'fraud, abuse, and waste' or 'waste, fraud, and petty corruption.'" "'Think outside the box' has become such a cliché that people use it without even thinking about what it means." "When I was in college in the sixties, I lived up to the cliché of the 'nerd.' I actually used a pocket protector." Side note: the original literal meanings of the words "cliché" and "stereotype" is the same! They both refer to a printing process in which a solid printing plate is made by casting type metal into a paper-mache mold of a whole page of type.

Your sentence: "Unless you change your cliché, you will be in trouble" sounds very odd. A native-speaker of English would have to stop and think first before he/she apprehended your meaning unless it was spoken within an understood context. I don't believe that you can use it as a synonym for "behavior".

Cliche is a typical or stereotypical behavior, often brought to an extreme. It usually shows a lack of creativity or unique thought. "It is really cliche for a white girl in the US to drink a lot of Starbucks." Cliche more typically refers to a frequent comment, joke, or phrase. "It's really cliche to joke about how much white girls drink Starbucks."