You can’t.

Not in the way you are probably thinking.

If you were, for example, an American born on us soil, you would have a birth certificate, social security number, many published records of your participation in school and community activities. If you’re old enough to drink alcohol, you most certainly have a government id and if you drove a car earlier than that you already had a government id. If you vote then you and your address are in the voter rolls.

That stuff’s not going away and the argument used by the nra to force batf to keep paper files instead of allowing them to digitize everything has been eroded away to uselessness.

You gotta recognize that you exist and everyone knows it.

Rather than any of the advice itt suggesting you switch to Linux, learn complex self hosting, etc: just recognize that the phone, accounts and computer you have now is main. If you want an alt:

Buy an iPhone or pixel outright and unlocked. No at the moment you don’t have any other options, sucks to suck. If someone says this is wrong information I recommend you don’t listen to them. If you bought a pixel it’s time to install graphene. Do your research and make sure you understand. If you bought an iPhone it’s time to harden it. Make sure your iCloud account is not tied to an identifying email and that you enable adp.

Buy a separate computer: it doesn’t need to be powerful. You’d be amazed what win 10 iot ltsc 21h2, sequoia or just Debian can do on decade old hardware. Make sure not to accept any invitations to tie your login to an account in the cloud and go from there.

Make some new accounts: start with an email and don’t tie any of your old accounts to it. If a service wants to verify using text, just use some text receiving service to bypass it.

If you’re worried that your alt and main will become associated because they’re coming from the same place, use a vpn on both. I like mullvad but there are others.