where i can invest my btc and i can get a good profit ...with minimum risk? 
You can invest into gambling sites, obviously suggesting this because you are making this thread in gambling section. The best ones I have personally invested are - bitdice.me , its easy and instant payments. Other than that you can invest in crypto-games though I never did.and if is not a secret could you tell me do you have a good profit from bitdice.me and how much time the site is running ?
You should remember one thing before investing in these gambling sites. The past performance is only for your reference and in future they may or may not be getting same profit because it all depends on how much house makes profits from that investors will get some profit. So if any one win a big amount than investors also will lose money. Instead of putting all your money in one site, diversify into few good sites to reduce loses.