Hi there! I’d probably jump into next month’s jam since this one ended at the end of February.
Generally I recommend people identify what interests them about the type of game they want to make and work backwards towards something they find compelling! Another good option is to take some time to analyze games that you like. See if you can identify what works for you and try to reinterpret them in your own style!
And then it’s work and testing. There’s no shortcuts for doing the thing.