Well, you seem to have the paper, but can you answer the questions? I imagine the officer had some reason to believe you weren’t qualified. However, if you are as convinced of your qualifications as you appear here, you can reapply whenever you like.

You may re-apply whenever you wish, but unless you have evidence of a significant change in your situation, you will most likely just be wasting your money. Note: If anyone contact you offering to “help” you get a visa (for a fee, of course), you will be wasting your money and may face administrative/criminal charges.