I Have 5 Months to Make $15k. Any Recommendations???

I am 19 years old live in Maryland. I am saving for something kinda big, but I am kind of stuck. I want to make 15k in about 5-6 months but I don’t really know what to do. My job doesn’t schedule that much and I DoorDash sometimes but it’s kind of hectic. What do you guys suggest? Thanks.