The new year has kicked off on the right foot for Bitcoin investors. The currency has continued with its rally, gaining $375 since the year turned. In the past 24 hours, the currency has gained 6.5 percent, finally hitting the $4,000 level again. The last time Bitcoin hit this level was December 25, after which it went down all the way to $3,650. The fightback is certainly noteworthy, but according to some analysts, it’s not yet time to pop the champagne.