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Are you wanting to do this to extend your LTE network through the house (from the hotspot)? What hotspot device/model are you using?
There are a few options here, but the best would be to buy a router that supports usb modem connections. Buy a lte usb adapter, and plug that into the router. That will give you the LTE connection speed to share internet access with all your home devices, and also give them a wifi network to share files/printers.
That is a basic one, and you can also hook up your dsl to it too, and use dsl as the primary network. If you need more bandwidth, unplug the dsl from the router and it would switch over to the lte connection.
There are other options (more expensive/complicated) involving a load balancing router, where you can have both networks connected at the same time.
It would use the dsl where possible and if the network slows down it can shift tasks to the lte connection.
With advanced configuration, it can even be set up to direct certain traffic only to the dsl. So if you had an automatic cloud backup for example that happens on a regular basis, and doesn't need to be fast as it is automated and run overnight, you can put that on the dsl only to save on data charges.