There are many options on that question. lmbo but umm ;; what do anda feel i your heart. its easier that way than any other way at all.. here are some that i would write 1.)Love 2.)Nature and maybe something rock like that has a playful feel to it :] idk if this helps but anything is worth a shot
anda could write romance atau even a life story. I write songs too and it's usual about something people my age can relate to. But that is my style. I would recommend something that anda like and anda would enjoy. Like if anda like pop then write pop. atau if theres something happening in your life that is not to personal then anda could turn it into a song. Hope this helps!