Can not connect to network

[Cdg688]

Hoping someone can help me. I have a gateway laptop model GWNR71517-BK. Three days ago I started having an issue connecting to my home network. Windows stopped finding any connections besides the 5G connection from my modem. The 2.4 connection is missing as are connections that usually show up in my neighborhood. The signal strength shows up as weak even though I am sitting right next to the router. When trying to connect to the 5G connection, windows asks me to put in my password, which should have been saved, and then says it can not connect to network. I have spent three days troubleshootin

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