How to allocate all my internet bandwidth dedicated to one device?

I've connected all the house's devices (Smart-TV, Laptops, iPhones, and etc) to my Wi-Fi but sometimes I need all the bandwidth dedicated to one.there's no possibility to remove all the devices from Wi-Fi because they're not all mine. How can I control bandwidth allocation?

You may block other devices.

QOS, most routers have it.
But this can't "tune" the Wi-Fi part, that is pretty much a fair share scheduler. This would only tune the router to the ISP.

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