Choose your hands
A common advice is to not open the betting with less than a high pair in your hand. And if someone else opens the bitcoin pot, you need at least that to call.
Do not be an open book
If you have a pair and draw three cards, the other players will know that you have a pair. If you always draw two cards when you have three of a kind, again your hand will be easy to read. The same goes if you never stand pat unless you have a made hand. By varying the number of cards you draw, you keep your opponents guessing