You want to earn the bitcoin or generate its how like we do in the bitcoin mining. If you want to earn the bitcoin there are lots of options with and without investment but you have to work hard to show the reputation in the forum to go with the service which is been used a long time alone.
Lending, altcoin creation, ICO implementation, creating a domain which is based on the bitcoin payment and ethereum based smart contracts. You can use any of these options to invest and make the money.