I need some ideas for a song topic. I dont really ever feel down or sad and most of my songs are happier(not peppy) ,bluesy or rock w/ less depressing lyrics.

But i was writing the other day and the chord changes were very emotional and i wrote some riffs and it sounds very sad and like a cry almost, but i dont know what i should sing about. Sure there are lots of sad things but i want something that could be personal to some people and very deep and emotional, what are some specific topics i could write about?