If you're paying cash you're honestly better off finding a freestyle coach from a decent snowboard camp to coach you, would be far better results from that sort of coaching.
Have you looked into proper freestyle coaching or is that out of your price range?
Also, make sure you aren't pushing yourself just to get sponsored. Ride and progress because you enjoy snowboarding, not because you want to be sponsored.
Sponsorship is overrated and very poorly paid for 9 out of 10 sponsored snowboarders. Getting a free snowboard each year doesn't exactly pay the bills.