@Bakero23 you msy need to either buy a new booster or better a third party whole home wifi solution. Sky will sell you either their Broadband Boost bundle at £5 a month which can supply a. Booster if required or their Wifi max bundle which is £7.50 a month and comes with a new hub and up,to 3 extenders if an engineer agrees you need them. Personally I use a third party solution as it cost less than a 18 month Wifi Max contract would have.
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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
