Announce a price increase to your customers

One thing that has worked for us, twice, is increasing our prices, and then making an announcement. When you make the decision to increase prices, put a banner on the pricing page, something like «prices are going up on July 1st», and announce it to your email list. You will see an uptick in signups, as people are motivated to get going. Make sure, of course, to follow through and actually increase prices