Learn how to craft a Good melody..

There’s a lot more to writing a melody than just rhythm. While you can come up with a decent melody with no knowledge of how to do so (trial and error), it’s a lot quicker and easier to know a few things.

I’ve written a post on this, so if you’re wanting to learn a few things about melodies and how to write them (catchy ones in particular), then read it before moving on.