Given that Louise Mallard, the protagonist of Kate Chopin's "The Story of an Hour," celebrated her husband's death, one can see her marriage was far from a happy one. In fact, the physical description of Louise speaks to her greatest problem with her marriage: "She was young, with a fair, calm face, whose lines bespoke repression."
There are two things in this description which speak to her unhappiness. First, she is young. Yet, Louise's face already has lines (wrinkles). Second, the lines were brought on by repression. Therefore, one can infer that Brently was overly protective and kept Louise from doing anything she wished to do. Brently controlled her.
Upon his "death," Louise looks out her window, sees the promise of new life in nature, and realizes she is "free, free, free." She would now be able to "live for herself" and not Brently.
Therefore, the advice Brently would need to make a second marriage happier would be to allow his wife to do the things she likes. He needs to allow her the freedom a woman needs to be healthy and not repress his wife either mentally or physically.