Maybe you can use it as wifi repeater, or buy a wifi repeater.
There are wifi router that can be configured as repeater. Go to your old wifi admin page, you will see an option that selected is DHCP. Basically that's the mode of the wifi. Change it to bridge mode. This will make that old wifi router a repeater.
https://en.m.wikipedia.org/wiki/Wireless_repeater
How to Extend Your Wi-Fi Network With an Old Router





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