The main thing with Brexit is that the British people had a referendum about it which decided the matter. The elected politicans need to follow that direction. So it's unlikely that it can be reverted without damaging the system of UK democracy.

The lib Dems wanted a second referendum about what it would mean, I think, e.g. soft Vs hard.

So it can't really be reversed but the angle can be changed as that has always been unclear.