Pat the steak dry with paper towels. Rub with avocado oil, sea salt, black pepper, garlic powder, and smoked paprika.
Grill the steak for 4 to 5 minutes per side for medium rare, or cook to your preferred doneness.
Remove the steak from the grill and let it rest for 5 to 10 minutes before slicing.
While the steak rests, make the chimichurri sauce by combining the parsley, cilantro, garlic, red wine vinegar, olive oil, lemon juice, sea salt, black pepper, and red pepper flakes in a bowl.