Trading. Because the other option is too risky and not smart option to choose.
Trading is risky too, but i have control about my bitcoin not just 'give' my bitcoin to other site.
HYIP, Revshare, cloud mining, mlm, and gambling the best way to loose your bitcoin, not recomendeed.
Trading is good but the best way is to have some successful business related to bitcoin like exchanges and gambling sites, they are probably swimming in bitcoin.