Harry Potter had the Elder Wand, Resurrection Stone, and Invisibility Cloak. If he hadn't broken the wand and left the stone in the Forbidden Forest, would he have become a Master of Death?
closed as primarily opinion-based by Paulie_D, Napoleon Wilson♦ Mar 20 at 12:43
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No, he wouldn't. After all the story about being "Master of Death" is just that: A story, better said a fairy tale within the Potterverse.
Death has never been involved in making these magical items. It has been the Peverell brothers as can be read in HP and the Deathly Hallows (emphasis of mine):
So it's true? asked Harry. "All of it? The Peverell brothers---"
"---were the three brothers of the tale," said Dumbledore, nodding. "Oh yes, I think so. Whether they met Death on a lonely road . . . I think it more likely that the Peverell brothers were simply gifted, dangerous wizards who succeeded in creating those powerful objects. The story of them being Death's own Hallows seems to me the sort of legend that might have sprung up around such creations."
* HP and the Deathly Hallows, Chapter 'King's Cross station'
That said: No death involved means no master of death...