Thank you everyone for your answers! Seems like signature campaigns will be my first move.
Before starting any signature campaign, first try to develop a professional ANN thread and try to convince people play at your casino. You can start my giving special offers / bonus to people who join through bitcointalk. Once you see people joining in, then you can start a signature campaign etc.
Also i hope that your new casino site is unique, attractive with things like no kyc, easy registrations and low withdrawal fee, etc so that people don't have any objection to playing at your site.
I also want to add that signature campaigns are one of the best moves of casinos, I know that sometimes casino platforms have to have additional capital to be able to take on signature marketing, but this will pay for itself in the long run, because the traffic and the clients that they are going to have are of a high level and of great quality, here in the forum there are players who have a professional relevance, and who bet with a lot of money.
You just have to look at the signature campaigns that are active at the moment, the platforms are currently very successful, and the best thing is that they always offer new ways to compete in very good raffles and tournaments.