1. Set your Instant Pot to sauté mode and add a splash of vegetable broth.
2. Add the chopped onion, garlic, carrots, and celery. Sauté until softened, about 5 minutes.
3. Add the chopped cabbage, remaining vegetable broth, salt, pepper, thyme, basil, and oregano. Stir well.
4. Close the lid and set the Instant Pot to manual high pressure for 15 minutes.
5. Once the cooking time is up, allow the pressure to release naturally for 10 minutes, then quick release any remaining pressure.
6. Open the lid, stir the soup, and adjust seasoning if needed. Serve hot.