Turn off the router WiFi. Buy a mesh WiFi thing (TP-Link Deco are popular round here but I haven't used them myself) and plug the first into your router with an Ethernet cable.
TP-Link Deco
this does look very promising
@swedeee started
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Turn off the router WiFi. Buy a mesh WiFi thing (TP-Link Deco are popular round here but I haven't used them myself) and plug the first into your router with an Ethernet cable.