WiFi range is poor.

Four questions:

• What is the make & model of the wireless access point, router, or gateway that is providing the Wi-Fi network?
• What is the make & model of the wireless client (desktop or notebook) that you are connecting to this network?
• What version of operating system is it running?
• What are you using to determine signal strength vs. range?

Use the 2.4 GHz network signal, since it much stronger than the 5 GHz signal

Remove obstructions in the signal path between the WiFi router and connected devices

Replace the WiFi router if it is 5 years old or older

Add another WiFi router in specific areas where you need more WiFi coverage and connect them back to the main router using an Ethernet cable