Preheat a skillet over medium heat.
Season the fish fillets with olive oil, salt, pepper, chili powder, and cumin.
Place the fish in the skillet and cook for about 3-4 minutes on each side until golden brown and flaky.
While the fish cooks, warm the tortillas in another pan or directly over a flame until pliable.
Remove the fish from the skillet and let it rest for a couple of minutes.
Flake the fish into bite-sized pieces using a fork.
Assemble the tacos by placing the fish on each tortilla.
Top with shredded cabbage, avocado slices, and a generous spoonful of mango salsa.
Squeeze fresh lime juice over the assembled tacos for added flavor.
Serve immediately with extra lime wedges on the side.