If you don't have much trading experience and are not aware of the fluctuation of price of various coins and don't have a lot of free time then day-trading wouldn't be suitable for you. As you are looking for monthly basis profits then short-term trading would work well for you.
Day trading with free coin will not happen too often you need decent capital to start trading and the make money from it.
There is no monthly or weekly based as long as when we decide to cash it out or all the profits will get compounded to the capital and will give more profits then initial.