Try to look in the altcoin section. There are always new coin releases almost every day. Just try to review the coins and choose what you think will be the best among them.

Not so pro tip: try mining a coin that has a low difficulty and try to keep it until it hit the exchanges. if you think the price is good enough, sell it all then repeat the process. Wait for a coin that you think will make it in the exchanges, mine it, hold it, then sell it off for profit.