Not take advantage of its full potential
Most likely, you purchased an air fryer so that you could prepare low-fat French fries and chicken strips. You're not alone; around 99% of air fryer sales fall into this category. However, if you just use your air fryer to make imitation fried foods, you are not getting the most out of it. Additionally, air fryers can reheat fried food till it is crisp and cook vegetables.
In fact, you can cook a complete roast chicken in the air fryer if your basket is large enough (or your bird is tiny enough). Simply season your chicken, brush on a little oil, and roast it until the thickest portion of the thigh registers 175 degrees. In an air fryer, why bake? You might want some freshly baked chocolate chip cookies even though it's August and a million degrees inside your home. You can quickly bake a batch using your air fryer without having to wait for the oven to heat up or increase the heat in your kitchen.