I found this exact prefix '19vkiEajfhu' within the 69-bit range, but from what I've read from more knowledgeable people on the forum, it may not have much significance idk. I'm just a hobbyist

You need to prove the 19vkiEajfhu prefix you found.
Otherwise, you won't be listened to much.

Edit;
After scanning 9000 trillion keys for the actual address (the good hash) of Puzzle 69, there was still no 53 bits or larger prefix found.
61eb8a50c86b0584bb727dd65bed8d2400d6d5aa
H160 - Is the first 61eb8a50c86b0 the one you mentioned as 53 bits?
If that's what you mean, I have it. 