The trouble here is that it is a relatively brittle alloy, and is already cracking internally from the original bend. It's weaker now. If you bend it back cold, it is likely to snap.
Heating it will allow it to bend back without damage. But how strong will it be ?
If you do decide to heat it, don't bend it hot. Apply liquid soap to the metal and heat with a gas torch until the soap is well burnt. Allow it to cool slowly (don't dunk it in water) and then do your bending.
Rather than try to bend the frame back, wouldn't you be better of trying to bend a sacrificial seat post the opposite way? A steel seat post will bend ok, and even if it does all go wrong, you haven't exactly lost out a lot.
Either that, or wear platform shoes on one foot to compensate 😄
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