Without Kurama, Naruto lost a big part of what defined his strength, and what also made him who he really is.
Although Naruto usually uses the Six Paths' Sage Mode along with the Kurama Chakra Mode, there is no reason he cannot use it without Kurama's strength. In fact, Naruto can still use the basic Sage Mode, which is enough for him to take down a roster of enemies.
While Naruto might have lost Kurama, he still has higher chakra levels compared to Sasuke. The reason is that he is an Uzumaki, and the people of this clan have strong life forces and high chakra levels.
Does Kurama get revived in Boruto? No, sadly, he won't come back. Tailed Beasts are basically made of chakra, so when they're killed, they return to chakra and will be revived soon. However, Baryon mode consumes Kurama's chakra until he die, so there's no chakra left in him, that means he can't be revived anymore.
Naruto has always been a powerful character, but his possibility of obtaining a new-tailed beast after Kurama's death could make him stronger. The increased power from the new-tailed beast could surpass even Baryon Mode, making Naruto a force to be reckoned with.
Because Tailed Beasts are life-forms made of pure chakra, they are eventually reborn after dying. They will always come back, but until that happens, they're factually dead. So, deliberately creating some new Tailed-beasts to get Kurama back does not seem like something Naruto would do.
1 Naruto Uzumaki
Naruto is the strongest known human in the entire series. Being the perfect Jinchūriki of Kurama, he's already head and shoulders above every Tailed Beast in terms of power. He also has the chakra of all the other Tailed Beasts, making him incredibly powerful.
Although Naruto lost Kurama, his Six Paths Powers should still be accessible to him. In Naruto's fight against Madara, he displayed the ability to use Six Paths Sage Mode without tapping into the power of the chakra cloak.
2) Hashirama Senju
Hashirama Senju was able to take on Madara and 'Kyuubi' cloaked in a Susanoo. His wood release is extremely powerful and he also has the ability to enter Sage Mode. Since Hashirama was able to beat Madara and Kurama cloaked in a Susanoo, he would be able to take on the nine tailed beast by himself.
Essentially, this means that Naruto has an eternity to train and get stronger. In this eternity, Naruto can easily devise ways to take his powers to the next level. He can improve upon his Sage Mode and develop new forms of it, or he can develop new forms of jutsu that would be unique to him.
Baryon Mode is a strength only accessible to Kurama and his Jinchuriki, where the chakra of both fuse together, similar to nuclear fusion, and give rise to new energy.
Without a doubt, the Ten-Tails is the strongest of all the Tailed Beasts.
When Sasuke absorbed the tailed beasts' chakra, he focused it all into his perfect Susanoo, which is why he was able to overpower several Kurama clones at once.
Kurama's Power Is a Result of Plot Armor
Similarly, Kurama being inside Naruto gives him the advantage of being sheltered by plot armor, in turn making him the strongest beast. Kishimoto also had to make Nine-Tails the strongest since only half of it was sealed inside Naruto.
In a fight against Isshiki Otsutsuki, Kurama sacrifices himself allowing Naruto to enter The Baryon mode. In this, the jinchuriki gains explosive power but it consumes the tailed beast. A new theory suggests that Momoshiki might have enough power to bring back the Nine Tailed Fox.
Without Kurama, he has the ability to develop his skills even further. With Sage Mode, he gets access to all his five chakras. And he can learn infinite jutsu. He also has access to all the tailed beasts.
Boruto: Will Boruto And Kawaki Surpass Naruto And Sasuke? Boruto and Kawaki might be on the path to surpass their predecessors Naruto and Sasuke. Boruto Uzumaki is the main character of the Boruto series, and, just as Naruto had his Sasuke in his story, Boruto has his Kawaki.
He will not be able to do anything to her in a fight, with or without Kurama's chakra. Even if he was able to attack her, from what Amado has explained, Naruto would stand no chance against her anyway.
Naruto has been able to harness and collect the natural energy around him in order to enter Sage Mode even after Kurama's death.
Yes, Naruto Uzumaki eventually gained full control over the Nine-Tailed Fox, also known as Kurama, in the Naruto series.
To sum it up, in the final developmental stage of a Susanoo, the Perfect Susanoo is stronger than Kurama on its own. However, that does not make it stronger than Kurama in every situation because the Tailed Beast can enhance the jinchuriki's abilities and turn the tables in a battle.
The Zero Tails is the only type of tailed beast that was not created by the Sage of the Six Paths, Hagoromo Ōtsutsuki, alongside the other tailed beasts. However, in the film, the nine-tails, Kurama, reacted negatively upon its appearance implying that he has a past experience with the Zero Tails.
6 Naruto Uzumaki, The Seventh Hokage And Ultimate Shinobi
He also gained the chakra of all nine of the Tailed Beasts, making him a pseudo-Ten Tails Jinchūriki. Even though Naruto is already stronger than the Ten Tails, his strength continues to grow even today.
Where are all the jinchūriki now? Naruto, Gaara and Bee are the only Jinchuriki alive in Naruto, which makes three Jinchuriki. The rest of them (except two) were captured by the Akatsuki and had their Tailed-Beast extracted from them (killing them in the process).
That plan ended up being Naruto's new form, Baryon Mode. Baryon Mode involves Naruto and Kurama's chakra coming together to create new kernels of power, a process that Kurama likens to nuclear fusion.