When you’re free motioning (or when you run out of thread in the middle of topstitching), you need to bury your threads. Often times, these are not nice long tails, they’re scraggly short pieces of thread. The best solution: self threading needles. I love these by Merchant & Mills that I picked up at Modern Textiles.
Basically, in lieu of threading the eye, you pop the thread in through the tension points on the tip of the needle. They’ll change your life.