Well this should be self explanatory, no? Why would you ever gamble for God's sake? If anyghing was possible by gambling, people would find ways in the last 100 years on making money, it's simple as that.
That leaves you with investing, but investing in what is a right question. I sgill haven't found anything worth of investing in the crypto ecosystem. Everything is full of scams and short lived pump and dumps.
Well this should be self explanatory, no?
If you don't believe anyone can make a profit by gambling, then invest in the house maybe? There are still a few decent sites that would offer such option.
So here comes my advice, don't do either. Leave your bitcoins in cold storage and wait for the mass adoption. This just might be your best investment.
And how will ever the mass adoption happen if everyone keeps their BTC in cold storages?