I will just say invest in Bitcoin, altcoins and tokens ICO market space is really getting pretty low and most of the new ones are just deciding things up with the whole STO daico and regulations plus invest and get half your money back if you are not carefully. Investing in altcoin might bring small return but atleast you are pretty safe
Not to say that it is safe, because some Altcoins can be removed from the stock exchanges, or they will not lead the development and they will collapse in price, so there is no complete security anywhere. Here you just need to be well versed in ICO and in the market to buy promising cryptocurrencies.