There are ways to add zest to your blog while staying focused.
For instance, many have found that adding interviews and group projects to their blogs worked really well.
You could even invite a lot of people to blog together at the same time.
There are a variety of different things that you can try on your blog. You just need to stay open minded enough to give new things a try once in a while. If one thing does not work well, move on to something else.
Use Popular Ideas
You can find out about hot topics to include in your blog with some simple and easy research.
One hot topic is weight-loss. This is a very popular topic today. People want to read about how they can lose a few pounds or get in better shape.
Weight-loss topics and techniques are incredibly popular
Weight-loss for new moms
Weight-loss for the middle aged man
Weight-loss after surgery
Weight-loss for menopausal women
You can also do some background research to see what is popular during that time. Big ticket topics are always things such as:
How to make money
How to improve your life (your marriage, your job, etc,)
Anyway, all you need is a good topic and to stay focussed on it - the readers will slowly increase.