Barcelona tried their best in this match, though Atalanta did well too, and they tried their best to see that they win the match, but unfortunately it ended in a draw. I think this could be a very good result for them if they win the match, although the result did not affect Barcelona since their position in the table is still okay. But Atalanta were trying their best to see that they win so they will qualify. But you are right; they can still do better in the coming round. Since they are not a weak team.
I doubt what Barcelona played yesterday was actually their best, considering the fact they had the most ball possession and shots on target in both halves of the game, because what I felt yesterday was that Barcelona was literally just too relax and never played aggressively just same way they played with Real Madrid few days ago,which was actually a strong team. Because if Hansi Flick really meant to win yesterday's game, he would have came up with a workable strategy, as it's obvious what they wanted was a draw.
I doubt so also because what they were showing in that game was actually their best they could give. They didn’t go for a draw but the team they played against didn’t give them a chance to allow that to happen. Barcelona was a very good team and I think they did their best and I applaud their effort to qualify for the next round of the competition without going for the playoffs. Barcelona are playing very well in the champions league and I really don’t have a doubt about them going forward after this round. It is going to be a very tough one ahead in this competition, and Barcelona are going to prevail further and prove their dominance better.