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Get a new router.
Smash all iot devices.
Remove all batteries.
Get a new phone.
Get a new phone number.
Disassemble all of your computers.
Microwave all computer parts.
Drill out the motherboard.
Throw out all usb sticks.
Buy all brand new computer parts.
Image the computer.
Verify the checksums.
Buy antivirus.
Change your password managers master password.
Get a trezor or other hardware wallet.
Call the FBI.