No one can generate a fixed amount of profit rather than staking or lending. Why you need 30$ profit daily? and it will be very risky if you are being suggested by a suspicious person. Because they will surely suggest you a phishing or ponzi scheme site and you will lose your investment. So try to go yourself to find out the investment which fits you.

I will obviously suggest none other than Bitcoin but it can't generate a specific amount of profit and you may lose too. But in long term you will gain a huge return obviously. But don't fall in a trap of any shit altcoins or ponzi site as someone can suggest you here or in your inbox.