Luckily, the Sims community is full of talented people who create custom hairstyles, clothing, furniture, and even gameplay tweaks. Related: The Sims 4 Mods You Didn't Know You Needed Until Now
But while the game has a ton of content, you might still like to get a little more out of your experience. Between the base game and the additional Stuff Packs, Expansion Packs, and Game Packs that have been released, it's basically impossible to get bored while enjoying a game of The Sims 4.