My laptop Internet speed has plummeted for no reason and only on my home network

A few weeks ago, while wirelessly connected to my home modem on my laptop, my internet connection dropped (<1 Mbps). I didn't see too big of an issue and plugged in ethernet directly into my laptop from the home modem, which restored the internet connection back to the typical (>20 MBPs) range. A few days later, ethernet dropped the same amount as it did wirelessly (<1 MBPs), and I plugged in a USB-C Hub with an ethernet port in it, which restored it to the typical range again (>20 Mbps). Sometime later, I moved my setup to a new room on the other side of the house, away from the modem, and plugged in an old wifi extender so I could use the same ethernet > USB-C Hub > Laptop setup I was using before, which decreased my internet speed, but it was still within expected speeds.

Attached is the testing I did during this time period, where, oddly enough, I was getting faster speeds through wirelessly connecting to my phone hot-spotting my home modem compared to plugging in ethernet. (Information via speedtest.net)

About a week or two after these tests, the USB-C Hub method had dropped in speeds (<1 MBPs), and now the only way to get any usable internet is to connect to my phone, hot-spotting my home modem. All other devices connect to the modem and the wifi extender with expected speeds. My laptop connects to other networks in other homes with expected speeds. No application-altering wifi was installed or modified on my system long before any of these events happened. I have Surfshark on my system, but it has close to no influence on my Wi-Fi speed, and all testing was conducted with Surfshark services disabled.

Does anyone have any idea whats happening here? It's not a modem problem because other devices connect to it with no issues, and it's not a wifi card problem as it can connect to my phone with expected speeds and other wifi networks with expected speeds.