Naruto recently lost Kurama, the nine-tailed fox he had been sealed with since he was a child, in Boruto: Naruto Next Generations . Kurama's departure certainly has a lot to do with Naruto's future. Moreover, Kurama is known as the main source of strength for the Konoha Seventh Hokage.
Since the war, Naruto has preferred to use Kurama's power over his own. This made Kurama's death even more devastating. However, because Naruto was afraid to use Kurama's power for half of his life, he developed many skills and abilities that were purely his own.
While harnessing his powers as a jinchriki, Naruto also has many talents of his own. Being Uzumaki and Ashura's reincarnation, Naruto's chakra reserves are already deeper than most shinobi, even without Kurama. His body also became stronger and more resilient because of it.
During the Chnin Exams, Kabuto claims that Naruto's power as a genin is terrifying. He could fight an entire army of shinobi if he mastered his chakra control. So even without Kurama, Naruto was already strong. Quoted from CBR , there are 7 reasons why Naruto can stay strong without the Kyuubi's presence. Here's the review!
1. Kage Bunshin no Jutsu
3. Kuchiyose no Jutsu