Try the following:
- Don't stick to the job title that you use in your company. Look for similar job titles that your potential candidates might look for.
- Ensure that the job description conveys the necessary information to your candidates and also at the same time, it is short and not too wordy.
- Include relevant keywords that your prospective candidates might use to search for jobs.
- Include a call-to-action - Call, Email or Apply, etc.