@Corinna3 give the new hub at least 24 hours to optimise but if WiFi coverage is still poor you may need extenders which Sky can provide as part of the WiFi Max add-on see https://www.sky.com/help/articles/sky-wifi-max
Every home is different but general rule is make sure the hub is out in the open on a surface so itsxsignals are not blocked by radiators and the like.
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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
