Hey ipad boomer:
Check your security settings. If you havent updated to 11.3, don’t do it. Keep your battery below 50% and power it down every night.
Turn off siri in every app.
Restrict your cookies permissions so you know when they are getting got.
Change your search engine on safari to duckduckgo
Set the rest of your apps to NOT run in the background.
Turn off gps/ location in apps too.
Basically lock down all the things that apple wants to “help” you with.