You can generate sentences of the form "This sentence begins with: " followed by seven comma-separated english words denoting hex digits. Then search that space of digits, until you get a hit.

For each digit combination, you can try it with multiple variations of the sentence like "The SHA256 of this sentence begins with", "The SHA256 hash of this text starts with" and many more. That increases the search space without increasing the number of digits that have to match, making it more likely that a hit is found.