Apply pressure with your various win conditions: Goblin Barrel, Wall Breakers, Princess, etc. Try to get as much damage as possible in single elixir. On defense, you can use your cannon cart or archer queen and apply pressure by counter pushing with a dual lane attack.
The Goblin barrel is the main win condition of the deck. Play as many of them as you can to do damage but also to bait the log out for your wall breakers and princess.
The bandit is great for sneaking in large amounts of damage when your opponent is out of elixir or counters.
The wall breakers are the secondary win condition of the deck. As a general rule don't play them the same lane as the goblin barrel to prevent spell value and to apply dual lane pressure.
In the early stages of the game try to apply pressure on both lanes and get as much damage as possible. It is important to do this because it can be hard to finish off games in double/triple elixir since we don't have a big spell.
In the later stages of the game try to stack princesses and apply insurmountable amounts of pressure on both lanes in order to prevent your opponent from building up a big push.