Wifi and Bluetooth have an weak signal unless next to router/device

The wifi and Bluetooth signals on my device are incredibly weak and unusable unless I am directly next to the router or device. However, the cellular service and data still functions normally. I have factory reset the device. This did not fix it. I replaced the wifi flex antenna with a new one straight from AliExpress. This also did not fix it. I have reasons to believe this is a hardware issue but I have no clue where to go next. There is limited information online regarding this phone (at least to my knowledge) and I was hoping that someone might've had a similar issue with this device or even another device. Would there be other components that I can replace/solder which would fix this? Thanks

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