Creative work without limitations is intimidating and stiffling. If every option ever is available to you, how on Earth would you choose what to go with? Fear of choosing, fear of making wrong choices.
You need to keep the endless options in check. You need to make — sometimes arbitrary — choices, that limit you. That limit the playing field and the scope of options.
Introduce a few rules, and obey them, blindly, whitout question.
Make it a habit to collect rules. Write a simple rule down on a slip of paper. Put it in a jar. Consult the jar, when you feel lost.
Here are some to get your jar started:
Two colours, one tone
Approach inside out
Starting to think? Turn the page
Repeat yourself 3 times
Only white hairline on black
Awkwardly holding the pen