Definitely trading , everything else is most of the time a scam and gambling make you greedy with time and you eventually lose everything If you don't want to stop. In the case of trading , If you lose there is no one to blame but your self unlike of gambling where you accuse the website of scam or cloudmining that keep closing it doors and run away with funds etc...
Why did not you think of signature campaigns? It is also a form of earn very high profits. If trading needs the capital and high economic skills, signature campaigns do not require such high demands. In addition, the trading still exists a certain risk ratio and the signature campaigns is almost zero rate, only profit is less or more.