Every day is different and you'll have evolving challenges during the lifecycle of your products or services. An important first step is taking the time to understand your audience and what value you are providing them or what problems you help them solve. For example, ask yourself how your apps save them time, make them money, or entertain them. Knowing who you are speaking to reduces many of these marketing hurdles. Be genuine, be honest, be consistent, and publish content that has value for your audience. Finally, research apps and services that can automate some of your outreach tasks and provide you valuable analytics on your efforts. And keep learning - read an article each day.