Cut the roast into 3 pieces.
Mix together the seasonings in a small bowl.
Sprinkle evenly over the piece of beef.
Add the beef broth, Worcestershire sauce, and garlic to the Instant Pot.
Place the beef in liquid.
Close and lock the lid. Set the pressure release valve to the sealing position.
Cook on high pressure for 40 minutes. Once the cooking time is complete, allow for a natural pressure release (about 15 minutes). Note: A larger roast might need more time to break down.
Open the lid and use tongs to transfer the beef to a cutting board. Shred the beef with 2 forks.
Return the shredded beef to the Instant Pot and stir it in the flavorful sauce.
Warm the tortillas on a skillet with a little cooking oil until flexible. Top with the shredded beef and any toppings you like.