Failover for only one of two networks

Hey Folks,

I am working in an ISP and I am running two networks on a single MikroTik Router BOARD 962UiGS-5HacT2HnT, port 1 & port 2 act as WAN for both separate connections and port 3 & port 4 act as LAN for both the connections (LAN 1 is 10.50.50.0/24 & LAN 2 is 192.168.50.0/24)

When the connectivity of WAN 2 goes down, I want the LAN 2 network to failover to WAN 1 and the network continues to work.

Please advise as to how I can get it to work.

Thank you

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