Instant Pot Shredded Beef Nachos

Name: Instant Pot Shredded Beef Nachos
Prep time: 10 min
Total time: 10 min
Cuisine: American, Mexican, Latin American
Ingredients: 1 2-lb. beef chuck roast; 2 tsp. dried oregano; 2 tsp. brown sugar; 1 1/2 kosher salt; 1 tsp. chili powder; 1 tsp. cumin; 1 tsp. garlic powder; 1 tsp. vegetable oil; 1 medium yellow onion, sliced; 1 (12-oz.) can Mexican beer, such as Tecate; 1 (13-oz.) bag corn chips; 3 c. Monterey Jack cheese; 1 c. drained pickled jalapeños; 1 avocado, cubed; 2 radishes, sliced into rounds; 1/4 c. loosely packed cilantro leaves; 1/4 red onion, finely chopped; Lime wedges, for serving