If you think "cryptocurrency will make you rich in a day', i will say you are living in the heaven of fools. Some one occasionally says this type of words, they have come to the crypto and now they are loser. Investment is different things. It can give you profits or loss but you don't think it makes you rich overnight.
It's very difficult but I think it's possible, as you can see there are few cryptocurrencies which increase thousands percents in just a day, if there is anyone is holding these cryptocurrencies, of course they'll become rich in just a day for sure. But it depend on how fast they can sell cause these pump often last for just a short time.