I have some investments in bitcoin casino, i made 5-10% profit / month 
Nice! 5%-10% is a good percentage and profit for a monthly basis with bitcoin casino's. And that is what I wanted to suggest, you can try to invest with bitdice.me
But the most effective and best way to invest in bitcoin is by just simply buying it at lower price which is quite hard to make it happen again.
The new low price for bitcoin will be at $1,000.
Investing in bitcoin is best way of investing. before investing on something make sure you have best knowledge of the market, then save the btc which will give you best in return. best place to investing is nothing better than btc. just compare the investment value with any other way of investments, it is much better investing here in btc.