I would vote Leave again, with a vengeance. I also know several previous Remain voters who are so fed up with the EU's negociating stance that they would also now vote Leave, even (?especially) if it meant crashing out - withholding the £39 billion.
However, realistically, the choice could not now be between leave and remain, as article 50 has been activated, and although we have not yet actually left, this is irrevocable.
The choice would be between leave and rejoin.
The EU has made it clear, as I understand it, that if we want to backtrack we could not return to the same terms of our previous membership. This would make membership much worse for us, tying us into the Euro and unification, among other things, and losing our rebate.
IMO we need to leave, not half leave. The EU is toxic and will not reform. It essentially exists for the benefit of Germany and is run by unelected despots - as we have seen reinforced in the Brexit negotiations.