Book Reports / Essay on fixations with the past relating to Gatsby and Hamlet ! [2]

I am writing an essay for my english class about people being fixated on the past and how this can essentially hurt your future. I need to compare Hamlet and Gatsby to this. My main point for Gatsby is that he couldn't let go of Daisy, which ended up leading to his death. My main point for Hamlet is that his obligation to avenge his father essentially led to his death as well. What I need help with is brainstorming more things to aruge about each character relating to their obsessions with the past. I appreciate your time, thank you.