Help! How do I convince the US Immigration that I need to go back to the Philippines for AT LEAST ONE YEAR. The application costs USD660 and if it gets rejected, I won't be refunded anymore.

I don't know how to word it properly but my reason is I need more time to complete all my financial and business obligations (selling of properties, closing of accounts, ano pa ba?) I am an only child and my whole family is in the US so I cannot rely on anyone else to do this. I will also study for skills that are in demand in the US. Most important, I need to make arrangements to ensure that my second Mom who took care of me since I was a baby will be okay when I am away. She is single and has no contact with her family anymore and I am her only family.

How do I make that condense and convincing?