A chronology for an ancestor can be a great way to see if there are time gaps for which no records have been obtained.
Keep in mind that at certain times during a person’s life they may leave fewer records.
And consider including multiple people in a chronology or focusing on something other than a specific person. One chronology I found particularly helpful was a large one that included several families after they had arrived in Chicago from New York State over several years. Including more than one person in the same chronology helped me to notice things that might not have been noticed had I concentrated on just one person.