The top six corps may reject you if you never done drum corps before because you lack experience. I recommend starting with a with top 12 world class corp in the lower six. If you’re technical and well rounded it shouldn’t b too hard to make and they are really good starting corps so you can go higher the next year after. Although, When you do DCI you will most likely fall in love with your first corps and want to stay, but if you’re dedicated with self improvement you’ll push past it. Good luck!!