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There are different strategies of promote. But in all of them the promoter have first of all to sit and to make research. He need to know who will play, the age of players, average bet, what games will be popular. After he get this information he can decide what advertise he need to choose - sometimes this is signature campaigns on crypto forums, sometimes social media, sometimes, may be TV. Different situations and different ways of advertise.
This is are very important questions op need to ask before thinking of advertising his casino if he intend to advertise one. The real gamblers needs to be estimated to know the actual participants and what will be prepared for them when the right time comes. There should be list of games that gamblers will like or are interested in so they can be the list of games that will be available on the casino.