Keep an IDEA journal. the ideas can be anything that comes to mind. the act of writing down stuff triggers creative thoughts on other ideas. you have a gold mine between your ears. mine the ideas out over time and you will be successful.
keep learning new stuff. Learn from competitive ideas, learn from points of view you might not like but keep learning. Dabble with art, writing, hobbies. just keep turning over the new stuff.
I don't do this one enough myself. HAVE FUN. All work and no play ends up giving a host of issue for reaching your success. Fun time allows the body and mind to relax, ranks right up there with sleep as critical.