What are the common mistakes while playing Rummy?

There are several common mistakes that players make while playing rummy. Here are a few: 

1. Holding onto high-value cards: One of the biggest mistakes players make is holding onto high-value cards for too long. If you have a high-value card that doesn't fit into any of your melds, it's best to discard it early on rather than risk losing a lot of points if you end up getting stuck with it in your hand.
2. Not paying attention to opponents' discards: Players often focus too much on their own hand and forget to pay attention to their opponents' discards. This can be a costly mistake as it can give your opponents an idea of what you're holding and what melds you might be trying to form.
3. Not keeping track of the cards that have been played: It's important to keep track of the cards that have been played so you have an idea of what's left in the deck. This will help you make better decisions about which cards to keep and which ones to discard.
4. Not knowing when to drop: Sometimes it's best to drop out of a game early rather than risk losing a lot of points. Players who hold onto their cards for too long can end up with a high score if they're unable to form any melds.
5. Overvaluing melds: While melds are important in rummy, they're not the only way to win. Players who focus too much on forming melds may miss other opportunities to score points.
6. Not planning ahead: Rummy requires a certain amount of strategy and planning ahead. Players who don't think ahead may end up discarding cards that they later realize they needed or miss opportunities to form melds.

By avoiding these common mistakes, you can improve your chances of winning at rummy.