I sub one vote to protonmail. Naomi Brockwell has a youtube channel. I will give you an odysee link.
https://odysee.com/@NaomiBrockwell:4/most-private-email:4
https://odysee.com/@NaomiBrockwell:4/Email-aliases:2
Here is a phone number privacy one. Because your privacy goes exponentially up if you can give out an email and phone number up for categories. One for finance one for shopping , one for friend and family.
https://odysee.com/@NaomiBrockwell:4/Getting-MULTIPLE-PRIVATE-Phone-Numbers:5
The my sudo app at the end of this one is I think the one thing you could do to increase company not correlating your stuff.
A protonmail or even keepass password manager , in it each account you have has a unquie user and password, and has a catorgory based email and phone and its own virtual credit card.
Short of Non kyc monero or bitcoin. Shrug.
If your in the usa, you can get a debit card for online use. you put in your debit card and they create a credit card that doesn't track back to you without a court order.
https://www.allthingssecured.com/identity-protection/9-best-alternatives-to-privacy-virtual-credit-cards/