If you want greater returns, then you need to go for HYIPs and other high-risk investments such as Bitcoin.
You can't seriously put HYIP's and Bitcoin in the same category of high risk investment options. Bitcoin offers a long term growth opportunity, which at the same time can function as currency, store of value, hedge, etc. HYIP's are nothing more than pure scams. In that regard, I am quite surprised that you advice people to put their hard earned money into obvious scams. It's a shame.