Warlocks... do you just cast Eldritch Blast every turn?

EDIT: What a friendly, helpful and funny community. Congratulations!

I'm in a game with friends, and I don't have the save file to tinker very much. I've googled around, but don't really see what I'm looking for.

When we play, I find that the best action every turn is Eldritch Blast... and now I just turned level 10, using it 3 times is even better! Am I missing something? Are there other/better things to be doing? It feels pretty simplistic to literally just find the target we're DPSing every turn, and EB it 3 times.