On winning small amounts, you can use any of these 3 ways:
1-Retain the amount in your account for future games.
2-Play many more lotto games to enhance your chance of winning the exclusive jackpot.
3-Donate those winnings to the Red Cross.
However, the choice is finally yours to make. I like to play additional games so as to boost my chance of snagging that exclusive jackpot prize while also knowing that anyway 40% of my stake is still going towards charity.