The bitcoin bockchain is the most secure and reliable "cloud storage". You could store the seedphrase inside a file directly on the blockchain using Ordinal Inscription. You would only need to remember a 6-digit Ordiginal ID for accessing that file.

You could start by creating a password-protected 7-Zip folder. Inside this folder, you can place a VeraCrypt password-encrypted vault. Within the vault, you can store an image file that utilizes steganography to hide a long text containing the seedphrase. You can keep adding more and more layers of encryption and obscurity.

It's highly unlikely for anyone to crack crazy complex setups like this. Even if someone were able to break through, they would still need to know the passphrase of the seedphrase to access your sats.

OR, you could do what DarthCoin did.