In Japanese, you don’t need to say あなた（you）many times. For example, ‘Do you like cats?’ in Japanese is ねこがすきですか。
The sentence can be あなたはねこがすきですか。with ‘you’ at the start of the sentence but Japanese people don’t say that.
It is obvious that the sentence is about ‘you’ if the question is given to ‘you’ by the person in front of ‘you’.
That is why they don’t say あなたは.