Not everything on your resume needs to be a paid job. A lot of mine is volunteer experience and internships. They are great fun because they are usually short-term and you can most likely have a professional reference from the experience.
On top of employment experience, you can also do short online courses! There are so many online that are free and can help build up your resume. Maybe you like data analysis, finance, coding, or writing. There are courses and information out there!
To employers it will show them that you are willing to continually keep learning and upskilling yourself which is a good way to make yourself stand out from the crowd!