They might change the course of history. For example, they could prevent some tragic events that happened in the past, which would then have a huge impact on the present and future they came from. Maybe they'd also meet their ancestors and learn a great deal about their family's past.
Boruto and his friends would face many challenges in adapting to the past. They are used to modern conveniences like instant communication devices. In the past, they'd have to rely on messengers or their own physical abilities to communicate. Also, they'd need to adjust to the different fighting styles and weapons. The ninjutsu they know might be too advanced for the past, so they'd have to be careful not to show off too much and draw unwanted attention. They might also struggle with the food and living conditions which were much more primitive compared to their time.
If Boruto traveled back in time to meet his father as a kid, it would be a really interesting scenario. He might be shocked at how different Naruto was back then. Maybe he'd try to teach young Naruto some of the new jutsu he knows, but it could also cause a lot of chaos in the timeline. For example, if Boruto accidentally changes something in Naruto's past, it could have a huge impact on the future that he comes from.
Well, the return date of the Boruto manga is often subject to the creators' schedule and various production factors. Usually, such information is made public through official channels or manga-related news sites. So, just stay tuned to those for the latest updates.
Sorry, I don't have the exact date for the Boruto manga's comeback. But you can follow the manga's social media accounts or check relevant manga forums for any possible hints or leaks.
One possible storyline could be Boruto going back in time to the era of the Fourth Great Ninja War. He could use his knowledge of modern jutsu to change the outcome of certain battles. For example, he might help prevent some of the casualties that occurred. Another idea is that he travels back to the time when his father, Naruto, was a child. Boruto could then learn more about Naruto's early struggles and perhaps gain a new perspective on his own life and the legacy he has to uphold.
One possibility could be Luffy changing key events to prevent the losses of his dear friends. This would add a lot of drama and emotional depth to the story.