I bought a cheap xiaomi 5g phone and a glinet slate. Usb tethered them for fast 5g internet but the pass through rate is only 200mb even though the phone can reach 500mb+ not sure where the restriction happens.
The plus side is fast unlimited Internet for £20 a month that has no restrictions at all (provider dependent). You are not location restricted if you decide to move you’ll always have Internet, useful if you are staying somewhere without Internet so long as it gets a cell signal.
The down side is if you live in a built up area the internet speeds are often all over the place with the occasional disconnect just when you least need one. It depends how many other people have had the same idea as you…
My advice is to at least try it once because if you don’t you’ll always wonder if it was a good idea or not. But the caveat is you’ll probably spend as much if not more on the gear to do it as you would a year fibre optic package. Its for the hobo lifestyle IMHO.