niche adsense website

I have a blog on how to save money. It’s a small niche topic so it’s hard to post quality content regularly, but targeted enough for Google Adsense. I thought about creating a self help and personal development site like Steve Pavlina. I would never run out of excellent content to print, but I’m afraid my Google Adsense ads would be very irrelevant because of so many sub-topics. What to do?

Betty