Especially in the snowpark you should evaluate how other boarder hit the obstacles. How much speed are they catching? How does their air movement look like? How are they landing? Judge their acting and reflect it on your own shred style.
Is your board meant for shreds in the snowpark? Have you tried other boards so far or talked to some experts about snowboards? Maybe this is your call to visit a Testival or ask your parkrat-friends to borrow their board for a day!
Know your body and listen. Go for the good slam when you have the energy. If not, it will get ugly and the risk of injury increases.
A good way of progression is to ride with boarder that have more skills already, that push you, watch out for you and teach you.
Learning by doing, be thankful and enjoy!