First, it seems that you have to put the exclamation point "!" at the end of the sentence; otherwise the meaning is unclear. Second, when we use the phrase "keep something in mind," we usually use a noun, a pronoun, or a noun phrase as the object of the verb "keep". We can't use a "that clause" as its object. For example, it is incorrect to say "Keep in mind that we are guests." However, it is perfect to say "Keep it in mind that we are guests." I hope this helps!
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