A creative idea could be to have Naruto's shadow clones train with different ninja clans' techniques. So, one clone is with the Hyuga learning Gentle Fist, another with the Aburame learning insect techniques. This would not only make for an interesting training scenario but also show Naruto's versatility and eagerness to learn.
In a fanfic, the shadow clone training could involve Naruto sending his clones to different dimensions for training. One clone could be in a dimension full of powerful beasts where it has to survive and learn combat skills from them. Another clone could be in a dimension with extreme weather conditions, forcing it to develop new ways of using chakra for protection. This would expand Naruto's skills and knowledge in ways not possible in the normal world.
Chapter 137, "Lai Fu's Death Has Another Cause", is the clearest early answer because the violence around Aunt Ying becomes final instead of hypothetical.
Chapter 12, "Drunk to the point of not being able to distinguish people after just two bottles?", is the clearest early answer because it turns Mother's situation into a concrete plot event.
Chapter 175, "He Tampered with the Food", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Wen Jiaojiao's eyes nearly rolled back into her head. and follows through with He couldn't say anything;
Chapter 62, "There is Something Strange", is the clearest early answer because it turns Guardian King's situation into a concrete plot event. The chapter turns that into something concrete by moving from Sitting on the edge of her bed, she pondered for a while before...
Chapter 186, "The Goddess Who Can't Stand the Smell of Pig Manure", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. It opens with Seeing Wen Jiaojiao bravely entering the pigsty, Jiang Yan couldn't...
Chapter 347, "Mirror Valley Council, Power Surge, Dajue Temple, Eight Battalion Tournament", is the clearest early answer because it turns Luo Ming's situation into a concrete plot event. Early on, As the first station in the Great Xia's expansion, Mirror Valley.... By the end, Since Luo Ming was newly appointed last year, he would likely be....
Chapter 127, "He's Not Snobbish, Just Simply Bad-Tempered", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. Early on, Witnessing Jiang Li leave with a bucket, Jiang Yan refused to admit....
Chapter 340, "Seclusion, Growing Yu Generation, Family Banquet, Rapid Development", is the clearest early answer because it turns Xia Yuyao's situation into a concrete plot event. The chapter gives readers a real answer by opening on But unexpectedly, at this very moment, the solemn and sacred... and ending on The last time Nong Ying carried the Second Prince, she wasn't paying....
Chapter 386, "New "Game" Mode", is the clearest early answer because it turns Du Sang's situation into a concrete plot event. Early on, Seeing Shang Shaojing's somewhat pale face, Su Yinwan's heart felt a.... By the end, After a long time, he finally spoke..
Chapter 151, "He Yun is quite good, but we are not fated to be together", is the clearest early answer because it turns Zhang Cheng's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Now it was Zhang Cheng's turn to be confused.