For the most part id like to share my strategy on how i play in arena, the team is quite good. If you play the game correctly, you should be able to keep a decent MMR and pick up 5 wins. Have you ever attempted to count your opponents' energies and cards? When playing Axie Infinity, keep the following points in mind:
Each card/move must be drawn twice by each of your Axies before it can be drawn a third time. This means that if your opponent plays Serious or Pumpkin in round 1 or one in round 1 and one in round 2, you can bet he won't play Serious or Pumpkin again until at least round 5 or 6. So, try to use this information to predict what your opponent will do. I try not to deal damage to tanks until I've seen both pumpkins.
In the early rounds, try to get a good amount of value out of your tank. Get some steals and damage into his tank, stack some energies, and give you Beast and bird a chance to finish him off. I usually only pay attention to what my tank draws in rounds 1-2 and possibly 3 depending on how the game unfolds.
A well-executed strategic skip turn can also make a significant difference. Because of your high energies, your opponent may anticipate an attack, so you can surprise him and skip, wasting energies on defense and opening the next round for attack, not to mention another 2 energies for you.
Make it a habit to check on the moves of your opponents by clicking on their Axies. It goes a long way toward preparing for the types of attacks that are likely.
Remember that the game is designed to be fair, so you will never win every game because some teams are simply not good against certain builds. The best players win between 50 and 60 percent of the time. If you can keep this up, you'll be fine.