There isn't any quick way to make large sum of money in crypto world. Of course, you can go for airdrops that are free and need minimal efforts. Also there are bounty campaigns on this forum that can help you earning good. But for that you need a better rank as well as you need to make quality posts. But, trading and investing are the best ways to make decent sum in cryptocurrencies. We still are in early stage of this crypto revolution. There are many good coins to invest upon which have long term potential.