If you are1st ,2nd, 3rd, and 4th in an intro you qualify for a regional ,so you can qualify for more than one.The year starts in June I think till end of may.Then 25% at regional go to final.I think
Now you need to make sure you enter a regional final - there is one at Stockand Lovell in May, I assume you are eligible for it. Then you have to practice your dressage like the blazes!!!