I'd say definitely start accumulating now. Especially under this recent dip it's very difficult to see prices going much further than this during a generally very bullish environment. Sooner or later, the recovery is going to start as people prepare for the halving.

I wouldn't give a concrete figure to the min/max values, though, because I think that's utterly unpredictable.

Cracking the all time high is probably not going to happen this year, but could occur after the halving.