We obviously need more data, but for starters: Figure out what your users value on and off your site. Also, research competitive and complementary sites to get

We obviously need more data, but for starters: Figure out what your users value on and off your site. Also, research competitive and complementary sites to get a quick and dirty list of potential options. There could be existing or future features that users would be willing to pay for. If your site doesn't display ads, carve out space so that you ease them into it. Set their expectations and you're less likely to shock/upset them (sage advice from Reid Hoffman).