Country
The membership must be based on some criteria that makes it exclusive and shows extraordinary ability. E.g. regular paid membership in IEEE is open to everyone, but becoming a IEEE Fellow has a higher bar.
Has your work changed your field or industry? Did it make a lot of money for your employer? Did you invent something or create something that was useful for many other people in your profession? Quantify the value of your contribution if possible.
Only materials related to your profession. If you are an software engineer but you write blogs about movies, that does not help your case. But a popular blog or YouTube channel where you teach others how to code and get into FAANG is good evidence.
Do not include materials that are not related to your profession. E.g. if you are a scientist/researcher, only articles about your research work are relevant. If you were in a local paper or blog talking about your photography hobby, that is not relevant.
E.g. reviewed manuscripts for a peer-reviewed scientific journal, were on a panel of judges for an incubator or business plan competition, worked as an instructor or teacher to train others in your occupation.
E.g. you were the VP of Business Development for a company and you helped them grow faster than ever; you were the lead engineer on a project that improved the company's manufacturing efficiency and increased profits. Be specific about numbers!

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