Keep in mind that it doesn't matter how long the wrench is, you cannot get more leverage than the radius of the wheel you're holding back.
So the key to getting more leverage is to hold either the wheel or remover rigidly. There are various tricks to bracing a wheel, but far and away the simplest approach is to hold the remover in a vise and turn the wheel to the left. Channel the spirit of Ralph Cramden making a hard left turn before the advent of power steering, and use both hands and body English to free it.
BTW- if it doesn't pop free, and you haven't heard spokes pinging and creaking, get a truck driver to turn it for you.
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