buy new wifi 6 ax usb adapter/pcie adapter + build mesh wifi 6 ax router network at your house using wifi to wifi to wifi system

they can have to improve your internet speed

try use wd40 fast dry contact cleaner for electronic parts to clean your laptop…from all dust/trash/ash/water/etc

after that wait for 1 or 2 days

try use official thunderbolt 4 pro cable from apple

try use boot hiren live cd/live usb for data recovery…

take apart of your pc and clean pc parts using fast dry contact cleaner for electronic