To prepare the leche de tigre dressing, in a small bowl, combine the ginger, garlic, cilantro, and lime juice. Set aside for 5 minutes, then strain the liquid into a large bowl, discarding the solids. Add the salt and chili paste.
Add avocado, fish, onion, sweet potato, blueberries, diced chili pepper, yellow chili paste, and cilantro. Toss gently to combine.
Salt to taste. Serve.