The best thing that you can do is just create a new signature campaign in here, it will attract a lot of users if you try to ask the participants to post on the gambling section only, because it will be a very targetted traffic, i do not know, just my two cents.
I agree, since this is really the biggest forum for crypto users then you can get a lot of traffic coming from this site. It is quite bolstering with gamblers and there are a lot of people that want to try something new. So I believe as well that this is the best place to be advertising your gambling site. Also, some of the best places to advertise are those cryto related blogs, trading information (coinmarketcap), and other platforms.