Cook the brown rice according to package instructions until tender and fluffy.
In a small bowl, toss the shrimp with chili powder, cumin, sea salt, and black pepper until evenly coated.
Heat the olive oil in a large skillet over medium-high heat.
Add the sliced bell peppers to the skillet and sauté for 3 to 4 minutes until they are tender-crisp.
Push the peppers to the side of the pan and add the seasoned shrimp, cooking for 2 minutes per side until pink and opaque.
Drizzle the lime juice over the shrimp and peppers, stirring everything together to combine the flavors.
Assemble the bowls by layering the cooked brown rice and shredded cabbage at the base.
Top with the shrimp and pepper mixture, fresh avocado slices, and chopped cilantro.