Sorry to hear you're feeling somewhat down. I'm sure it's your baby, so you may find it hard to part with it, but if it is one of your options, I run SideProjectors - a market place for selling/buying side projects.

https://www.sideprojectors.com

Someone mentioned flippa here. Similar, but we focus more on indie developers. Can't guarantee you it'll sell. It'll give you some exposure, but who knows. We've had a plenty of side projects exchanging hands over the years. It's an option you can consider!