I've worked as a waitress, newspaper reporter, public relations consultant and assistant media planner. If I thought long and hard, I'm sure I could come up with a topic idea for each occupation. Such as:
Waitress - How wait staff and kitchen staff can peacefully co-exist.
Newspaper Reporter - How to conduct an insightful interview.
Public Relations Consultant - How to effectively pitch a great news story.
Assistant Media Planner (in an agency setting) - How to build good relationships with media reps.
And of course, being a mom. One of my first ideas that sold was an article about how to prepare your meals before bringing home a new baby. People may bring you loads of baby gifts and clothes after the birth, but they don't always remember that a home-cooked meal is always appreciated by the new parents. They are usually too tired and frazzled to properly shop for ingredients and cook dinner every night. This idea sold at least three times.
See? There's plenty of material out there, you just have to brainstorm it and put it together. Can you come up with your own list of topics based on the jobs you've worked before?