Warm olive oil in a large pot.
Stir in celery, onions, peppers, and carrots; sauté until soft.
Stir garlic until fragrant.
Pour in chicken broth and stir.
Combine diced tomatoes and chopped cabbage.
Bring to a boil, reduce heat, and cook until cabbage is tender.
Stir in oregano, basil, pepper flakes, black pepper, and salt.
Taste and adjust seasoning. Serve hot and enjoy.
