7-zip maximum compression rate setting, how to compress 7zip to the minimum

I found that the compressed package downloaded from a certain download website will be larger than the original compressed package after decompression. The difference is tens of Kb and tens of Mb. If it is uploaded to a cloud disk or paid space, It doesn't matter if there are few files, but if there are many files, the storage cost will be greatly increased. I studied it specifically and can learn from it if necessary.

Compression level: 9-Extreme compression

Dictionary size: 256 or 384, the more compressed the dictionary, the slower it is. The compression rate difference is larger before 256MB, 384MB There is no difference in the compression rate

Word size: maximum 273

Parameter: f=BCJ2, the compression rate will be higher if the test parameter is added

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