I have already invited a few friends via a special link, but I did not get much real profit, apparently, the affiliate program is not so generous.
You say that you did not get good profit from the affiliate program, the question is "are your referral made deposit and play then lose their money?"
AFAIK affiliate program which is based on revenue share will give you commission once your referrals lose some money.
Even if you have many referrals but the amount of what they lost on the site is small then you will get small amount as well.
Correct me if I'm wrong.
Does the casino have a cashback program? For example, if I lose $ 1000, I would like to get 5-10% of the lost funds back.
Yes there is cashback once you are joined on the winz club but there is no specific information on how much you get from the cashback.
It is part of their VIP program, you can read more details about it here
https://winz.io/winz-club