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.
After the death of Kurama, he lost the large chakra pool he once had due to the Nine Tail. That played a huge role in performing some of the techniques that demanded a lot of chakra. In conclusion, it is doubtful that he would receive another power-up in the Boruto series.
Baryon Mode is one of Naruto's most powerful forms, allowing him to tap into Kurama's full power and use it to defeat his enemies.
Despite all of his efforts, Naruto will ultimately end up becoming the new Sage of the Six Paths, stopping his son and bringing a new era to the Shinobi World. He will be able to obtain power far greater than anything he had before, becoming not only the protector of Konoha, but also the entire human race.
He gained this power after meeting the Sage of Six Paths, Hagoromo Otsutsuki. When compared to all his other transformations, the Six Paths Sage Mode is extremely special. It makes Naruto strong enough to trade blows with the likes of Six Paths Madara Uchiha and even Kaguya Otsutsuki.
Despite the loss of his dear friend, the Seventh Hokage can still use the Sage Mode. Fans were delighted to see that Naruto still retained some of his powers and that he is capable of taking down strong opponents. However, he had to use Shadow Clones in order to collect the natural energy.
Without Kurama, Naruto lost a big part of what defined his strength, and what also made him who he really is.
Like Sasuke, Naruto was gifted with Six Paths Powers from the Sage of Six Paths himself, making him one of the strongest people out there. He also gained the chakra of all nine of the Tailed Beasts, making him a pseudo-Ten Tails Jinchūriki.
The only two ways Naruto can get the rinnegan is through blood transfusion from Sasuke or absorb enough of Sasuke chakra and merge with his chakra.
Naruto also ended up receiving the Six Paths Senjutsu from the Sage of Six Paths and when combined with his Sage Mode, it gave rise to one of his strongest forms called the Six Paths Sage Mode. In this form, Naruto became strong enough to fight the likes of Madara Uchiha and even Kaguya Otsutsuki.
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).
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.
As Naruto's overall strongest form, Baryon Mode gives him god-like power that allows him to surpass Isshiki Ōtsutsuki himself. In this mode, Naruto has incredibly heightened power, speed and reflexes that make him next to invincible.
If Boruto manages to learn how to control the different chakras inside of him, he might become the next jinchuriki – as he is an Uzumaki too. Though not much is known about the Karma mark other than the threats it has caused. But it can also be used to bring back Kurama.
To the fandom it seems that, although it would be extremely difficult, it is not impossible, and at worst the fight might result in a draw. The reason for that is, even without Kurama, Naruto still retains his Sage of Six Paths mode and his own Sage Mode that he mastered through training.
Kishimoto has always told us that Sasuke and Naruto will always be equals. Now, Sasuke has lost his rinnegan, Naruto has lost Kurama. If Sasuke ends up getting rinnegan back, then, yes, Kurama will come back, or vice versa.
In the Fourth Great Ninja War, Sasuke Uchiha, who was already the reincarnation of Indra Otsutsuki, met Hagoromo after he was in a near-death state. Just as with Naruto, Hagoromo gave half of his chakra to Sasuke, which led to his left Sharingan turning into a Rinnegan.
After receiving half of Hagoromo Otsutsuki's chakra during the final battle against Kaguya, Sasuke awakened a Rinnegan in his left eye, which allows him to use all the Six Paths Techniques, plus one space-time manipulation power that is unique to Sasuke's Rinnegan,...
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.
Later, after Madara once again sealed the nine tailed beasts within the Demonic Statue, the Ten-Tails revived once again.
Kurama is the strongest of all the Tailed Beasts and the iconic partner of Naruto Uzumaki. However, other than Naruto, Kurama also had other Jinchuriki. Kurama was formerly sealed in mito Uzumaki and, Kushina Uzumaki after her.
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.
In Boruto, Kurama did die, but he can be revived because Naruto has his chakra mixed with the Kyuubi after spending so many years without any seal. Reviving Kurama is only possible because Naruto's got power of six paths light which gives him the power to revive beings, organs, known as Yin Yang Release.
Madara's strength in his ten tail Jinchuriki form was even higher since he was able to take on all the tailed beasts at once. He can also link up with ten tails in his ten tail Jinchuriki form and immediately take down Kurama without struggling too much.