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Here is repository of deletion links for popular accounts. https://justdeleteme.xyz/
So using the github repo Holehe specifically checks for your email across (I believe) 300+ sites. That might be a good place to start.
This is a good reminder to always use Bitwarden. From what I can tell they monetize it for companies and 2 people plus so they shouldn't be in any monetary trouble. Their base line for one person is completely free and as someone who uses it on phone and pc, I can tell you it's amazing. It automatically syncs and it's open source: https://bitwarden.com/. That way every time you make a new account somewhere, it keeps a record for when you want to autofill.