What to add?
There are several options listed below, but this list is not all-inclusive:
Diced fresh Tomatoes. They will also cool the heat if your salsa is too hot.
Diced fresh Onions- Green, red, yellow, white or all 4!
Fresh corn, cut from the cob. (Canned corn works, too!)
Canned Chipolte Peppers- mince one or 2... add a T of adobo sauce, too. Chipotle is a warm Chile and the seeds are HOT.
Finely diced fresh salsa Chiles, such as Anaheim, Poblano or Jalapeno.
Chopped fresh Cilantro... YUM!
Canned black beans (rinsed)
Crushed Red Pepper
Salt to counteact any undesireable sweetness
The Emergency Salsa Surgery I performed on a top-rated brand of Salsa took all of 3 minutes. I used fresh tomatoes, 1 red jalapeno pepper, canned corn, minced chipotle w/adobo and fresh cilantro.
You see the before and after pictures... there's a bowl of warm, crunchy Tortilla Chips waiting ...
which Salsa would you rather scoop into?