People who are living in countries where cryptos are banned can contribute by educating other people about cryptocurrencies who are not still aware of it.
Given that bitcoin is already banned on your country then why bother talk about bitcoin to others ? I think its useless because they cannot still use it anyway . you will only risking you self because you are doing illegal things that is against the law . all i can suggest to you is to wait for your government or country to unban/allow the use of crypto and that is the time to start your advocacy about spreading the word bitcoin to other people .