Besides the Bitcoin there are several other currencies favorable for huge profit like Ethereum and Altcoin etc. furthermore some are more profitable for long term while some are less profitable for short term.
The success really depends on how hard working you are and what kinds of services and products you are offering not just in this industry but also in others. But obviously, making a business in this industry is more better specially now that the numbers of people getting involved in cryptos are increasing. This will only mean that they would want to use their bitcoins into getting the services they want or buying the things that they want without the hassle of converting into fiat as well.