If you were a brand struggling to sell on Amazon then you need to take expertise advice in order to improve the sales. There are Amazon Agencies who offer complete management on your Amazon seller Central account and charge a certain fee by optimizing your listing and working on the PPC of the account.
However, if you are even don't know which product will be profitable or else can't maintain Inventory by yourself then there is done for you Program started by Done for you amazon business where you just need to invest the money. All the activities from sourcing to managing and selling the products will be taken care by them.
The Program requires you to pay $50000 and expected to be in more than 100% returns, even if in worst case, the sales didn't met the expected amount and you didn't earn $50000. Whatever the remaining amount which you need to get will be paid by the company if you no longer want to be part of the Program. Thus this done for you program is one of the best investment opportunity to grow your brand on Amazon by just investing, sit back and wait for your sales to be take care by the Amazing Marketing Co.