Sorry to hear that. I would say keep trying. I would also ask them if they can provide reasons for why they rejected you. This would help you to work on these areas in particular to have a better chance of getting in next time. I know that SDM stresses a lot on work experience, so perhaps it's a matter of waiting until you get the amount of experience they are looking for (on average 10+ years of experience). Either way, keep trying! I hope you do get into what you want sooner or later!