When shooting outdoors and the sun is still shining light, a flash unit isn't strong enough to project that far into the distance. The sunlight outdoors is too bright for the flash to compete with it. I don't know if you are familiar with the Inverse Square Law, but Peter Hurley does a decent job of explaining it. Basically at one foot from the flash, the light output is 100%. When you double the distance (in this case, that would be 2-feet), you quarter the power - or in other words, the light output is now 25% of what it was at 1-foot. Double the distance again (which would take us to 4-feet), and it is now 25% less than it was at 2-feet.
Godox makes the AD600 Pro which is a portable strobe. Even with its light output which is far more powerful than your flash, it doesn't always put out enough light during bright daytime hours unless certain things are done or used (such as using a scrim, an ND filter, HSS, or additional strobes).