Anonymity

None. Once it's on the Internet it's collected by every single intelligence agency in the world.

Buy a new SSN or equivalent gov ID.
Relocation.
Facial reconstruction surgery and tibia height adjustment.

>>60358340
Is tibia height adjustment non-negotiable?

>>60358400

Depends on how committed you are to truly being free from data collection as height is one more data point they can identify you with.

>>60358254
1.) Stop giving them any new information. Stop using Google, Facebook, Microsoft, etc.
2.) Wait.

All the stuff they already have they'll remember forever. But it's not nearly as useful to them, or as privacy-invading to you, if they know all the details of what you were interested in in 2007 but haven't heard from you since.