im developer and i have a idea to make a decentralized poker and black jack (as start) game/casino
game will be 100% decentralized
the only problem is :
will it get audience ? is worth to put time into this ?
Nobody knows for sure. But FWIW, Polymarket (which is somewhat decentralized prediction platform) become very successful despite only released 4 years ago.
how to advertise ? if i do all project myself , how much money do i needed to advertise and make it successful ?
Since you have no idea, consider hiring marketing agency. Some of them even offer limited free consultation.