Wi-Fi signal shows on ground floor but not on upper floor | Router to Router connection at LAN Cable

Connecting Two Routers within One Network: Boosting Wi-Fi,Connect Two Routers Configuration with LAN Cable \ How to extend Wi-Fi range using two Wi-Fi routers?
How to connect 2 Routers to 1 Home network
Tenda AC5 AC1200 Dual Band WiFi Router – Main Router (Block)
D-Link DIR-615 Wireless-N Router (First Floor) White

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