What would be good alternatives that could replace the phrase "come on?"

Native speaker’s answer
Rebecca
Some phrases to replace the use of "come on" in this context are: "are you serious," "hey", "really", "seriously", and "unbelievable". Ex: Hey. I take this seriously. Ex: Really? I take this seriously. Ex: Are you serious? That's not the only reason. Ex: Seriously? That's not the only reason. Ex: Unbelievable. I take this seriously.