the first don't invest in hyip site or ponzi site only wait to scam
you can use youre bitcoin to trade or buy ico coin
another you can invest in bankrool gambling site, bitdouble.io, moneypot or crypto-games.net
I do not think that investing in gambling is a good idea. Now among them there are many scammers. Yes, this sphere is profitable. But it is very difficult to find a reliable project.
You can try, if you are not afraid to lose your coins
I think investing in legit you gambling casino is one of the good place where we can invest it not so risky but expect that you can be lose..
For now the good thing the best you can invest your money is the place where many people are staying like trading site which is you need knowledge in order to make a good profit. .