[@Obsidian], the elemental domains are rather lacking. (For the record, Teknall is currently our defacto Earth god, although if you want Earth go ahead.) However, don't feel like you have to take an elemental domain. There is a lot to choose from.

The best place to start, if you're struggling with Domain/Portfolio, is to consider a character concept. What do you want this character to do? How might they interact with the world? Good guy, villain, or somewhere in between? Have you got a personality or archetype you would like to play? Once you consider some of these questions, then you might find it easier to pick an appropriate domain/portfolio.

Of course, playing mortals is fine too, if you prefer, although you might feel a bit more invested if you had a demigod. And, of course, having a demigod doesn't stop you from exploring mortal characters simultaneously.