investment with bitcoin or any businesses related to bitcoin would be a good idea and of course we need to make sure that the investment that we are planning to deal with is legitimate we don't have to invest to a lot of websites , buy bitcoin and then hold it and make it as a long term investment also investment with ICO is a good example .
you can do all of these and make more money than ever it is called diversification. you invest your money in bitcoin and in gold and in other stuff that you may find profitable and then you can also invest bitcoin itself too in order to make even more bitcoin to have more profit.