Toss the sirloin steak tips with Worcestershire, garlic powder, salt, and pepper. Set aside for 20 min to marinate. Cook sirloin steak tips in oil and cook until desired temperature. Let them rest while you make the salad.
In a large bowl, add olive oil, balsamic vinegar, salt, and pepper. Add arugula, cucumbers, and avocado. Toss to coat. Divide the steak into two plates and serve with salad.