@Linda+Mn is this the WiFi signal in an area of your home or the broadband connection to the Hub? Not quite sure why you were advised to get a Sky Q box as while they can extend WiFi there are cheaper and simpler ways of doing that unless you already had Sky Q and the new box was a Sky Q mini.
If you post some details of your problem forum members can advise if possible include your Sky hub's connection stats see Find your Sky Broadband router statistics
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
