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I am not an expert in encryption or plausible deniability, but couldn't steganography be used to conceal sensitive information? I realize steganography would be problematic if you need to store large amounts of information, or need to modify the information often, but couldn't it be used for small amounts of information that doesn't change often?

Couldn't you tell an attacker "It's just a picture of my cat."?

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I'm not an expert either, but I think you could also use a one time pad to do exactly that.

You have a picture of a cat, and 2 one time pads (OTPs). OTP #1 is the key for your real data, and you can generate OTP #2 such that it decrypts the ciphertext (in this case, an image) into whatever data you pick.

Whether this is practical is a completely different question though.

https://github.com/gzm55/dpad-enc Here is a poc to encrypt just static pieces of short secrets in to a large enough file, and decrypt only one secret by select a correct password.

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