Season the cooked sushi rice with rice vinegar and sea salt, stirring gently to combine while the rice is still slightly warm.
Slice the sushi-grade salmon into long, thin strips and butterfly the cooked shrimp by slicing them down the back without cutting all the way through.
Julienne the cucumber into thin matchsticks and thinly slice the avocado.
Place one nori sheet on a bamboo rolling mat with the shiny side facing down.
Spread half of the seasoned rice evenly over the nori, leaving a 1-inch border at the top edge to allow for sealing.
Arrange half of the salmon, shrimp, cucumber, and avocado in a horizontal line across the center of the rice.
Lift the edge of the mat closest to you and roll the nori over the filling, pressing firmly to create a tight, uniform cylinder.
Repeat the process with the second nori sheet and the remaining ingredients.
Use a very sharp knife dipped in water to slice each roll into 6 to 8 bite-sized pieces.
Serve the fresh rolls immediately with coconut aminos, wasabi paste, and pickled ginger for a clean and vibrant meal.