The Ukrainians have already won in Bakhmut. Their goal was to tie up the Russian forces and keep them busy and taking casualties in one area over the winter. That goal has been achieved.
What was Russia's goal? All they have achieved at the cost of thousands of lives, and ten months of effort is to capture most of the ruins of a small, empty city. They have moved their front lines a few miles, at the price of about one Russian soldier per foot.
From what I understand the slow taking of Bakhmut was intentionally done by the Russians to grind the Ukrainian army to dust. Considering that the military paper that leaked indicates that the Russians have been killing Ukes at the rate of 7:1 and possibly even 10:1 or higher, would prove this strategy out.
Both sides are waiting to begin their offensives and counter-offensives until the mud dries out.