[HELP] Laptop wifi doesn't work if not connected to mobile hotspot?

I'm experiencing a strange issue with my laptop:

About a month ago, I had to use my phone’s personal hotspot as a Wi-Fi extender because my laptop couldn’t connect to Wi-Fi. Now, I've moved the laptop closer to the router, but it still refuses to connect to any Wi-Fi networks (can't connect to this network). The only way I can get internet access is by turning on my phone's hotspot, but the speed is extremely slow.

Does anyone have any suggestions on how to resolve this? Thanks!