DM: Problem of Sample size

what is proper sample size?
How could we say that this group is too small, and the other is large?

If there is proper size of sample for analysis, and the sample that we
have is too small,
please, let me know best way of increasing the sample size.

I consider two possiblities. One is data duplication and the other is
inclusion of old data having  a little different pattern that I think.

thank you in advance.
regards.

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