Most of the people have strategy to get out the small profit and then use some amount of the profit for investment purpose like you .
In my case , I get into at the end of the month , I makes calculations and withdrawing 50% of the profit for the cash ( as a earnings to make life live easy with the fiat ) and rest of 50% get back to the investment .
In actual in the investment I usually prefer to make investment of 25% profit in real better coins and rest of 25% in those fake coins which are listed in yobit which are giving about 1% to 10% profit in one day ( usually I put investment at the dump and get out with 5-6 days stability ) .
So in this way not only I am trying to increase my portfolio but also I am increasing my earnings from investment in worst things in this field .
But when I get no profit at the end of the month , then I tried to play small gambling , to get small profit ( strange but it is working method for micro earnings for me at the end of month ) .