Keep updating and evolve

You thought you were done now? Ha! No way! Your job is never done! The internet moves and changes every single day! It is important to frequently change your website, so that the user will always expierence something new and something diffrent! Don't let your site rust, or your profit will rust too.
Try new things and see if the amount of visitors improves (or not). Don't be afraid to try new things out. Keep your site interesting with for example polls, forums,... The ultimate goal is to make the user want to come back as much as possible (Facebook, Google, News sites,...)

I hope you learned something. Goodluck!