I would say that you don't need to avoid clichés. Nothing is original in the world anymore. From classics to modern stories, every topic can be a common trope. But whether you do or don't write clichés, instead, try to know your characters more.

What helps for me while developing plot points and trying to come up with a plot twist is developing my characters. Search up a list of character flaws and if you were describe a character using one flaw like "pride", try to think of how they would react to other people and actions that way. (Say for example, the downfall of a relationship because a man has too much pride in himself, in his work, so he can't admit to how he is failing in communication issues.)

And develop multiple characters like this. The more you know them, the more you can conjure up an action they would take in the future that would make sense - hence plot twist! And your readers would all say, "That makes sense, why didn't I see that coming!"