Ground sirloin typically does not have a lot of fat, so when you remove it from the Instant Pot, and add the onions, you might need to add a small amount of butter or Olive oil to saute the onions in. After you've cooked the Chili, and removed the lid to the Instant Pot to stir the Chili, place a small amount of chili in a bowl, and taste the Chili. If it's not seasoned enough for you, add a little more of all the spices: Chili powder, Cumin, garlic salt, seasoned salt, and brown sugar. Stir well, and let the Chili sit for 5 minutes, and taste again. Some Chili powders are stronger than others, and you might need more of the brand you have. Keep adding a little seasoning until you get the flavors you want.