If you're dumb enough to still use Google/Gmail (like me), then at the very least, change your privacy settings:
myaccount.google.com
Obviously, you should expect Google to still keep a record of everything you give it, but these settings will, bare minimum, not make search/YouTube/etc. use every single bit of data that Google has collected on you. So, you can search for things without worrying about every subsequent search result being affected, for instance.
