It's hard to say for sure. The decision depends on various factors like the popularity and demand for it, as well as the plans of the creators and publishers.
The timing of its return is unknown. Usually, such decisions involve a lot of behind-the-scenes work and coordination. But stay tuned to the latest manga news outlets for any updates.
Gula was a character in Dragon Ball Super. He was Flisa's older brother and had higher strength and potential than Flisa. Gula appeared in the movie version and Dragon Ball Hero, and showed his powerful combat ability. His form was more advanced than Flisa's, and he had even forced the Super Saiyan into a desperate situation. Gula's strength and potential were obviously higher than Fliesa's, but he disdained to compete with Fliesa for the throne, so he did not become the emperor of the universe. Although Gula appeared in the movie version, his strength and character status made him included in the official history of Dragon Ball. All in all, Gula was a powerful character with potential, and he had a complicated relationship with Flisa.
The return of the Dragon Ball manga is uncertain at the moment. It could be a while, as there are many things to consider like story development and publishing schedules. Keep an eye on the official channels for updates.