If you have worked at the same company for a while but aren’t sure what your job title is, then you can always come up with one yourself. Of course, you don’t want to embellish your role within a company, either. If you are a junior bookkeeper, for instance, claiming that you were the chief financial officer at your last job is not exactly truthful. Being caught lying will only harm your chances.
Instead, research the most common job titles in your industry. Read through the job descriptions and choose one that best fits your current role.