Hobby Income and the new PayPal reporting

I'm concerned about the new tax laws and wondering if I should continue to sell my Art online.  My hobby income has more than doubled this year so far to be around $8000, but it has cost me $2500 in materials. It doesn't seem fair to have to pay taxes on the entire $8000 but rather $5500.  My main form of payment is PayPal through a Facebook shop so I'm thinking I will receive a 1099-k, any advice on how to proceed?