Hello guys, with the current situations of market can we share some little few tips on how to possibly multiply our bitcoin portfolio without engaging in any ponzi scheme??? 
Buy low and sell high in trading. You can also try mining, I heard its still a good source of income if you have a good rig. To be more productive, you can also join bounty campaigns, this will give additional money and it will also widen your knowledge about altcoins and bitcoin. Hope this helps.