WiFi repeaters exist, at least in the USA. Put one in a place which can see both the router and into the room with the laptop.
Alternatively place the router's antenna (US terminology) where it can be seen in the laptop's room. This will require an extension cable and might end up costing almost as much as a repeater and be a lot more clumsy.
A WiFi repeater is a store and forward device - it receives a packet and then retransmits it. Thus the maximum throughput / speed will only be half as fast as without the repeater. But at least you should be able to communicate.
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