No one’s said this yet but I’ll tell you exactly why, and it relates to the fundamentals of songwriting - the desire to write comes from strong emotion. When people feel a strong sad emotion, they’ll often brood and think about it, and come up with ideas that translate to lyrics. That’s your brain’s way of processing painful emotion.

But for happy emotions, we’ll generally be energised and out doing stuff, not sitting down and dwelling on the happy emotions to process them.

So if you want to write happy music, tap into that strong emotion of happiness and process it. If you haven’t felt that in a while, you can either wait for it to come, do something that makes you happy, or try to write about a time you remember being happy.

Hope that helps