Pat the sea bass fillet completely dry with paper towels and season both sides with sea salt, black pepper, and garlic powder.
Heat the avocado oil in a stainless steel or cast-iron skillet over medium-high heat until the oil is shimmering.
Carefully place the fish in the pan, skin-side down, and sear for 4-5 minutes without moving it until the skin is golden and crispy.
Flip the fillet and cook for another 3-4 minutes until the fish is opaque and flakes easily with a fork.
While the fish cooks, steam the asparagus spears and cauliflower rice in a steamer basket or microwave until tender, about 5 minutes.
In a small bowl, whisk together the Greek yogurt, lemon juice, and chopped fresh dill to create the sauce.
Plate the cauliflower rice and asparagus, top with the seared sea bass, and drizzle with the creamy lemon-dill sauce.