do you know any more deposoting services with interest about 4%?
I don't know any such services who can provide a fixed interest for your bitcoins.
That's why what I do is I take some extra risks and invest some of my bitcoins and other coins in casino bankrolls. One of my best casino bankroll investment is crypto-games. In a year you can earn easily more than 4% profit. But you need to be careful because this is not a guaranteed return and sometimes you may lose if someone wins a big amount. If your not a risk taker then better don't invest in casino bankroll investments.
how can someone be careful about something that is out of his hands? I mean when you invest in a casino bankroll, it is not up to you to change what happens. you invest what you can afford to lose (like any investment) and then it is pure luck and also honesty of the casino to whether scam you or not because there is no way of proving the fairness of the investment part of the casinos! for example a whale winning big time may not even be a real person!
as for investment the only other sure thing I know of was investing a large amount of bitcoin (I think 100BTC was min) in a mixer (bitmixer.io to be exact, which closed down a while back). but generally if you invest in a real business you should be able to get a good profit and with low risks and higher rewards. the problem is finding that business and also having a larger amount of bitcoin than 1-2BTC for instance.