Pick a new and hot tool in an unfamiliar language or with technique requirements that are not in your comfort zone. Build something with it! Try out a new IDE

Pick a new and hot tool in an unfamiliar language or with technique requirements that are not in your comfort zone. Build something with it! Try out a new IDE, or workflow. Read some code in an open source project that you use a lot in your current work. The purpose of all these is to gain a greater understanding of what is possible! This is something as a self-taught programmer I do often.