No sale for my Online Store

Hi! Everyone, I have hit a dead end and I feel that someone here will be able to help. I have a really good online store which is not making any sales if you can change that in the next couple of days will be wonderful. If you can work on my project and I do great sales I will agree a price with you to pay you. Please forgive me Freelance admin if this is not a practice I could adopt to save my business from hitting rock bottom.