I spend a lot of time talking with bloggers, and across the board a common challenge is coming up with fresh content. One common tactic of bringing in fresh content way is by seeking out contributors.
But even then, your site needs to be attractive enough (content, design, platform) to warrant participation, so in that respect it can be back to the drawing board.
One technique I use is taking apart some of my old content and pinpointing a sentence or paragraph and then expand that idea.
Read the entire article by Louis Pagan at Latino Rebranded.