Got Sky Broadband and also 2 x Sky boosters however my home office seems to be a dead spot and causing me issues for work teams calls etc

My home office is converted from internal garage.

I have tried products that route signal through plug socket but they just never seem to be any good.

Does anyone know of any Broadband Services where a technician can come out and review and look to improve? Or should I just get another telephone connection in my home office? Most products I see have issues with sky broadband. I have sky glass so not sure I can change provider.

We get about 50mbps when near main router.