What wold be a good WiFi booster or repeater?

the router is on one side of the house, and I am on the other other,
There are times I only get 1 bar. not good, so Ia m looking for a booster, or a repeater.
I do not know the top speed, but I know we can do 70 gig is 4 days, so the booster or repeater needs to handle that much.
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