Add the sour cream, cotija cheese, diced green chiles, chopped cilantro, red onion, jalapeño, garlic, lime juice, chili powder, and salt to the bowl with the corn. Stir everything together thoroughly until the sour cream coats all the ingredients and the dip is well combined. Taste and adjust seasoning if desired—consider a bit more lime juice or a handful of cilantro for a brighter flavor.