I was asked a lot of questions about techniques when playing melody notes. Almost all thought that they should strike the melody notes harder. I used to think the same exact thing. The trick is not to play the melody notes harder, but the empty spaces softer. It’s all about technique and it comes with time. Don’t try to rush it, just know where you want to go and take some steps towards it.
The most important thing is to have fun. If it gets frustrating, just start stumming and singing. The banjo is to have fun with, don’t let it get you down.
Remember if you figure out what the song is, let me know and I’ll send you the tab with the lyrics!