Sorry to hear you are still unwell. I would stop using Advil for now, as it is an NSAID and can affect your immune system. It blocks prostaglandins, which helps to reduce fever, swelling, and pain, but prostaglandins are also involved in the healing process. It can also affect cytokines (which are involved in mucus production), although I read some time ago that it may sometimes make symptoms worse. Maybe try paracetamol for now and try to support your immune system.

You know chicken soup is good when you have the flu. I usually boil a whole chicken, add ginger, some spices, and vegetables. It is very easy to make, just put everything in a pan, You need the nutrients from the bones too, so let it boil gently until soft. It can help with mucus, keep you hydrated and help boost your immune system. Get better soon!