In One Piece, Sanji's rise to power might be embarking on a path that is different from Germa modifications and turn its focus on the idea of a potential awakening of Conqueror's Haki. According to this theory, in order for Sanji to awaken this legendary ability, he must not only confront his traumatic past but also reconcile with his family legacy.
The key to his realization of the full potential might be his emotional growth and not just his physical strength. As the Straw Hats get closer to the final saga, this evolution could completely change the way Sanji fights, thus marking a turning point in his skill and character development.
Disclaimer: This article is a speculative theory and reflects the writer's opinion.
Sanji’s path to Conqueror’s Haki in One Piece

The core of this theory comes from the perception that Sanji's powers are interrelated. His characteristic flames, the increase in physical forces obtained from his Germa descent, and the possible Conqueror Haki all seem to draw from the same emotional and genetic root.
During the One Piece journey, the most powerful techniques used by Sanji would always link his emotions and his memories. This technique necessitates him to have good emotional reserves, which means that his strength levels correspond to the amount of emotional turmoil he is ready to face.
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Haki, which is the most basic form of will and power, is similar to this pattern completely. The ability is visible in those who possess a king's qualities, including resolute beliefs, abilities in leadership, and the strength to impose one's beliefs on the world. Sanji has these characteristics; however, he has always been able to keep them under control because of his fear of turning into his family.
The emotional obstacle that is keeping Sanji from awakening is mainly his denial of his Germa background. Judge's harsh treatment and the family's lifeless state created such profound fears in him that he's afraid of becoming like his family and losing his humanity. This internal struggle has caused him to limit himself in such a way that he has not been able to unlock all of his powers.

It is the same kindness, empathy, and protective instincts that Judge considered to be weaknesses that form the basis of his kingly nature. The way forward includes Sanji needing to recast his beliefs about force and self-identification. Instead of seeing his Germa lineage as a pollutant to his true self, he ought to view them as tools that will hone his nobility.
His flames grow stronger with emotional intensity, and his protective instincts are driven by compassion. He might be able to awaken his Conqueror's Haki once these qualities are fully acknowledged and not feared.
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Final thoughts

Sanji's journey towards Haki in One Piece represents more than just the power gained. It represented the victory of willpower over genetic disposition, proving that one's race and upbringing are not necessarily what determines a person's fate.
By accepting both his gentle heart and his enhanced abilities, Sanji could forge a new definition of strength that would honor both his chosen family and his genetic legacy. This emergence of power would not only enhance his fighting skills but also fulfill his character arc.
He would transform from someone running away from his former self into a real king who is aware of every element of his identity, yet lives by his moral compass.
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