What can I do to keep my casino site users active?

[swift]

There are some casino platform that usually record a huge amount of users registeration , while the users are not even active in the platform and this is actually some kind or sort of serious issues in a casino site , it could be that the casino site is actually missing something and needs to get it solved

What can I do to keep my casino site users active? ,like what do you think I could do ,to make them more active in that order