I don't gamble as i am very bad at it, i lost over 0.5btc at Primedice

I am searching for any reliable investment site,
Any suggestion with be appreciated, thanks...
Then why take your gambling to the next level? This gamble will really worth your risk.
You can earn more profit with the amount you lose on PD if you will try to learn the art of trading. You able to reach such amount in a period of time playing in PD so I think you can put some too of your precious time on learning how trading works.
Don't just expect luck come to you automatically but rather help yourself to magnet that luck in order to gain profits.