Where can I invest 4k bitcoin
To make profit daily 100$
It seems to me that you are setting yourself too high a goal, which may involve high risks. Ponzi schemes can promise you a similar profit. And if you decide to take a risk to earn a similar profit, then this will be the first step to lose your money.
even a ponzi can make the money disappear in a short time, and it is very risky. However, with $4k capital, I think it is still very difficult to make $100 per day, even when he is building a personal business. Also, I think the fastest path is to trade, only it requires special skills to earn $100 per day with $4k. well, with minimal capital, the target is too high, so it requires a big risk.