You have till Feb 2017 to get this Chomper, which is more then enough time.
It took me about 2 month to go from level 84-313.
Best tips I can give you.
- Play G&G as it's the highest money maker
- Buy the 10k Crazy packs
- Eventually once you have all the customization items, you will only get consumables and a good chance of skip stars
- Level up all Classes to level 10 first, by doing this you will get an extra 10k coins each time you level up a class past 10
- Skip only the challenges that will take more than 2 games to achieve
- For easy money play classes that will net you more coins, such as healing with a Sunflower or building teleporter with the Engineer
- Concentrate on Vanquish Streaks, not so easy but once you reach 5 kills in a row you net yourself 200 coins per kill
Good luck.
