You have basically two choices:
1. Try to find a road with no crown, and see if it "steers" to the right. This is zero cost.
2. Put the car back on the alignment rack and realign. This is about US$110.
It seems to me that with certain tires with straight shoulders, they do have a tendency to "steer" to the right on crowned roads. Try a parking lot (with no huge drainage depressions), and see if it pulls to the right.
However, if the car pulls to the left on corwned roads, (and you are in the USA), then there might be an alignment problem. Try the cheap solution first.....Andras