What suggestions do you have to promote free courses in technology and software use at a local library?

The library I work at has additional programs that are heavily funded by grants. However, we have not been able to get adequate attendance to even warrant asking for a continuation grant. Courses involve computer basics, ms office, resume building, photography and editing, etc. We want patrons to learn work-related skills, but we just haven’t received the participation we had hoped for. What suggestions do you have? Thanks.