i would get a cheapo pre-paid smart phone and use the data to reset ALL your passwords, with actually good and unique passwords, as well as force logout any other logins if possible. don’t connect it to your home wifi etc. then look up how to do a clean factory reset of your various devices, including your router. set your shit to private also.

it sounds like a mix of paranoia and technological ignorance. you might not need to go absolutely ham on all your devices but it sounds like you aren’t even sure where or how this started, so i would personally suggest that just to get it all over and done with so you can go back to normal.