It is possible to progress without blocking. If you choose to do so, watch your opponent's body language to learn when he is about to hit you, then dodge. This is easier and faster than blocking, and allows you to use counter move quickly and start a combo.
Coins
Replay older fights to earn coins to spend on extra card packs to train your fighter.
Fighters packs
Save money to purchase the major packs in the store as they become available. You will get extra fighters to help you complete the live events.
Special moves
Each special move is more effective in some situations than in others. Know your moves and select the best one for your current situation. You can have up to three special moves ready to be activated in each fight at any time. Read the body movements of your opponent. Activating a special move while he is blocking, dodging, or about to hit you will result in failure. Only use your special moves when you are sure they will hit and result in maximum damage.
Training
Only spend cards that will give a bonus to your fighter (same card). By doing this, you will receive six times the experience and can keep all the other cards for future skills. Learn all the upcoming skills that your fighter will unlock by leveling up. Make sure that you never spend those cards. When first starting, do not spend all your cards; instead progress through the fights and earn coins. If you do not max out all events, return later and earn more training cards.