Turn it off, burn it to ashes, throw the ashes in a lava pit, and never look back. Seriously.
I used to participate in a conference few years ago where white hat hackers showed how they can bypass pretty much every security system. Thereʼs even a company that has the mission to do the same; they claim that if you disable every communication with the outer world except email, you can get hacked.
Thereʼs no such thing as “completely secure”. You can make it “pretty secure” by installing security patches as they are available, not installing any software you donʼt actually need, and think thrice before sharing anything with others.
Security is hard, and usually very inconvenient. Good luck with it.
Turn it off, burn it to ashes, throw the ashes in a lava pit, and never look back.
Only this <3