"Stuck it out" is a commonly used phrase to describe a person's perseverance in a difficult situation. However, there are many synonyms for this phrase that can be used to add variety to your writing. Instead of using "stuck it out," you could say "persevered," "endured," "weathered the storm," "stood firm," "remained steadfast," or "held on." All of these phrases convey the same meaning as "stuck it out," but they allow you to mix up your language and make your writing more interesting. Whatever synonym you choose, it's important to remember that perseverance and resilience are admirable qualities that should always be celebrated.