These are some tips for playing Clash Royale.
Of course, leveling up will make sure your towers have more health, and make your enemies be mad because they got matched with a higher opponent. But upgrade cards that you use most.
Upgrading Tesla when you use GoHo decks will be a waste of gold. You could have upgraded something else.
Lets say that you have just entered a newer(and higher) arena.
- Don't play multiplayer for 1~2 days. This is because you might be demoted and say you got nothing while staying in that arena. Use Free Chests and donations to stablize some newer cards.