Getting a platform that will give you a weekly or monthly return is not impossible, in fact it's all dependent on the product offered on the platform. For example, you will be able to make daily profits on cryptocurrency platforms that offer crytpo trading services by performing day trading activities on them, where you buy low and sell high depending on how the market moves.

Also, there are offers where you can support the platform by making use of their staking products and you're rewarded on a fixed plan, it could be weekly or monthly.

You can also embark on savings plans, where you're given a certain percentage over a period of time you must have chosen, for example there a USD savings plan on Quidax where you're rewarded 7%-10% for saving on annual basis depending on how long you choose to save.

Above it all, always consider how secured the platform you'd be choosing is, check the interface and make enquiries on the safety and always keep your details to yourself secured.