Acting is more than reading the lines on a page. Make sure that you know your character and listen to the other actors.

Read the article by Marcus Geduld,

https://www.huffpost.com/entry/what-are-some-of-the-tell_b_1579801

Get the Constantin Stanislavski book about building character

https://www.amazon.com/Character-Bloomsbury-Revelations-Constantin-Stanislavski-dp-1780935676/dp/1780935676/ref=mt_paperback?_encoding=UTF8&me=&qid=1556657228