[Question] Attempt at a gears model of getting infected with COVID-19

I read a bit but don’t know how good my understanding is. For reasoning about TAFFIX or the RaDVaC vaccine it would be good to have a decent gears model. I’m writing my current model so that others can check it for errors and not for others believing my model:

There’s SARS-CoV-2 particles in the air around you.

You breath in those particles.

If your nasal cavity is lined with mucus, those particles get onto the mucus and the mucus traps them. The mucus however itself doesn’t kill SARS-CoV-2 particles in it.

There are two ways of getting rid of the mucus with the SARS-CoV-2 particles. Either you blow your nose and get rid of the mucus in your nasal cavity that way or you shallow it.

If the body knows how to defend against SARS-CoV-2 from a previous infection it puts antibodies inside the mucus to bind the SARS-CoV-2 particles. If the SARS-CoV-2 particles however aren’t bound they sometimes get again into the inhaled air and make it into the lung or the go from the mucus into the nasal tissue.

Once antigens enter the nasal tissue, the mucosal immune system starts producing antibodies for those antigens so that they get trapped in the mucus and in the nasal tissue.

If there are too much SARS-CoV-2 particles the immune system in the nasal tissue doesn’t manage to handle the threat in time, the SARS-CoV-2 particles grow in quantity. The get into the lymph and blood and travel through the body. Then the normal immune system kicks in and tries to fight it. If there aren’t many particles it somehow manages to fight it (so that there’s a threshold for infection) but if there are too much it first has to go through effort to build up the immune system defenses and there’s a COVID-19 infection.

Is there something wrong in my recounting or something important I’m missing? I’m also happy of other resources that give a clear gears model.