BTC has risks as well as high profits. The deposit interest of commercial banks is very low compared to the profits of BTC!
I very much agree. Bank investments are arguably more secure but with very small returns over long periods as compared to crypto which depending on the market can either put you at a loss or a profit. But putting all in one is a risk, which I guess you was willing to take.
In most of the cases the large respectable banks don't give many percents for interest deposit. The small banks can take a long-term loan from you for a significant amount of interest, but they can crash or their working license might be invalidated. So the small bank investments are risky too. Bitcoin is a good asset to invest in, but I advice to diversify your funds between crypto-currencies and fiat-currencies and a shares.