You can invest in casino's ,if you can do some analysis about their past years and the profits for them and their investors.
banks are good but diversity is important.
Bitcoin is already an investment so putting investment into an investment as well will burn you someday, it is best to avoid it. By investing in bitcoins you could keep it safe by yourself and sell it few months or weeks later when it is higher , you could get profit and there is no risk like keeping your bitcoin at casinos