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It's always great to have lots of options, but thought you might want to know because he has been around a while and many people are already participating with him, so it might be a bit harder for you to get lots of people with similar ideas. Changing the theme every week is a great idea. There are others that do that too. Have you checked out the contests that are already going to see where you own personal niche might be? I'm sure you'll find more inspiration there.

Thank you for your advice. I will personalize the next competitions more. Thank you! :)

You're welcome. I"m sure you'll find the perfect thing to share. People here on Steemit really love contests and challenges and love to support them.