This is not a path for everyone, but...
If I were dead set on being a 100% rhinologist, I would open my own rhinology practice. There's a 100% chance of getting the job!
1. Find a smaller metro area that is underserved with ENT. To avoid living in Tumbleweed Town, I would go with a minimum 100k metro area population. There "should be" about 1 ENT physician per 35k population, so I would look for an area with only 1 ENT per 50k (or higher) population. This plan will not work in a saturated big city market.
2. Open your own practice - exclusively doing sinus, nasal, allergy (maybe snoring and/or cosmetic depending on your interest). You'll need office space, furniture/equipment, medical supplies, and allergy supplies. I would get an in-office CT as quickly as possible. You'll need 2 MAs to start- 1 to man the front desk and phones and another to room patients and help with procedures. You'll also need someone to handle billing- either outsource or hire someone in house. All this can be financed and you can hire practice management company to help you get everything set up.
3. If you picked the right market by following the criteria in #1, you will start seeing patients quickly. As soon as the allergy side of things picks up, hire a dedicated MA for testing and vial prep. Consider hiring a PA or NP to handle allergy, as it is very protocol-driven and routinized. That way you can focus on sinus and nasal procedures. A lot can be done in the office- balloons, Vivaer, turbinates, and so on. The local hospital or ASC would love to have you operate- sinus and nasal cases are very profitable for them. As a fellowship trained rhinologist, you can handle the weird revision frontals and gnarly AFS cases, and you will definitely see this stuff.
4. As things get busier, hire an office business manager but it is vital you oversee things, keep control of banking/payments, and always know what is going on in your business.
Again, it's not the path for everyone, but this would be a likely path to have a very profitable rhinology practice in a couple years.