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[Avengers AoU] How could Ultron have won?

I mean what little tweaks in his plan (which you have to admit was a pretty damn good plan in context and was really close to succeeding), could he have made either from the beginning or amidst the battle that would have had things turn out in his favor?

A weak example, I think if he had had a wider variety of troops he might won. So more than just those simple disposables one punch robots. Maybe a robot hulk?!
gpt
* Completely assimilating JARVIS at the onset instead of crudely ripping him apart. Saves the trouble of the nuclear codes being protected, Vision turning against him, and keeps the element of surprise. 

* Not bragging about his plan before he put it into action. He could have raised an army before the Avengers realized who or what was responsible. Staggering out with that leaky robot body was creepy, but completely unnecessary. 

* **HACKING IRON MAN'S ARMOR.** Seriously, Ultron superseded JARVIS, who remote controls every suit. Why did he not lock in Tony and force him to do his bidding, or make his suit suicide bomb a building? This was a frustratingly huge plot hole for me. 

* Design each robot body to absorb Thor's lightning in the same way Iron Man's suit can. Ultron's seen the designs and Tony's notes.

* Never allying with Scarlet Witch and Quicksilver. He never needed the help, and it only widened the circle of conspiracy enough to give away the secrets that undid him. 

* Scarlet Witch's contribution of "darkest fears" could be replicated--Ultron has full access to the team's files and histories, and the intelligence to make inferences. It would be child's play for him to design Joker-like scenarios to test each member's limits. If they refuse to play, people die. 

* Using his worldwide control of the internet and electronic systems, hold the world hostage unless each Avenger submit themselves (at separate locations, lest *teamwork!* save the day) for execution. Every hour they refuse is another hospital's life support gone or another plane falling out of the sky. Even if neither of those options are available, simultaneous attacks on eight or so small towns will ensure that the death rate keeps rising. 

* Have each and every one of his troops emit an earsplitting cacophony of overlapping voices through their speakers. Ultron doesn't need audio to communicate with himself, but the Avengers do. 

* Similarly, burn all farmland, poison all water. Ultron needs neither. 

* Any sort of strategy on the part of his Sokovia troops besides "charge." At least he didn't follow the one-at-a-time minion strategy, but any military commander would give their stripes to have a hivemind army. Separate the Avengers. Dig the ground out from under Cap and Witch. Push Hulk off the edge of the city. Snipe Hawkeye and Black Widow. If he hasn't hacked Iron Man already, bury him under sheer numbers--his suit can only carry the weight of seven others. If Thor's lightning isn't just recharging the troops, then...just try and keep Thor busy. 

* Using some troops to keep civilians hostage. The Avengers waste time trying to extract innocents who are holed up in shelters and guarded. 

* Spare troops scattered all over Sokovia not engaging in the fight. As soon as the Avengers move on to rescue civilians, have the hidden troops move in. 

* Taking potshots at the hover rafts. If nothing else, it'll force the Avengers to once again protect the civilians. 

* Have the repulsor reversal switch be wirelessly (radio, etc.) activated. No need for physical bodies to turn it. 

* **DON'T TEAR UP THE V1 ULTRON PRIME JUST FOR THE SAKE OF A PUN.** How many times would having two Big Bad bodies have saved him?

* Spare troops scattered and hidden all over *the world.* Even if everything goes wrong with his master plan, he's only back to square one. 

**TL;DR: Make it like the comic "Age of Utron," where everything was so shot to hell that they had to go back in time twice to fix it.**