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To make that an argument, you’d have to prove that a thing must have the properties called nature, act and power.If a nature’s existence or act is not necessary then it follows necessarily that the reason for its existence is not in its own nature or act and therefore does not exist by its own power. This means it is a dependent being - dependent on another being for its existence. If there is no necessary being then there is no ontological basis for its existence.
But surely they’re unnecessary complications, and even without them there are many issues with the notion of necessary existence, some of which are summarized here - philosophy.lander.edu/intro/necessity.shtml
Things exist but could have failed to exist, including the universe.