After that the SSD has been deleted, is it too late to use encryption for more security before selling?

My goal is to make my data inaccessible to the person who will buy my Macbook opportunity. While I'm fully aware that this is an almost impossible task to delete really an ssd, I read that if you encrypt everything before you wipe the drive and reinstall the OS, at least, the recovered data can be read.  However, I read these seemingly wise advice AFTER I had already deleted my Macbook and reinstalled the operating system.  So, the question is with my 'deleted' data and the operating system reinstalled, activation of encryption at this point will achieve my goal, or still will remain unencrypted data previously of the ' erased '?

Thanks in advance for your answer.

She will remain unencrypted.

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Tags: Notebooks

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