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If what you mean is the Atalanta team, I also have no doubt that they will be much better than this season in the next season, but that doesn't just revolve around the best players, it also includes the tactics they have at the moment. they can develop it again in the next season. Because there are many people who didn't expect the tactics that Atalanta had this season that they were able to win the Europa League which was quite surprising because before that no one predicted they could win with conditions like that.
Atalanta need to stop selling their important players like they sell Hojlund last season. They will play in Champions League next season, they will need to upgrade their squad depth to able to compete with top teams. Gasperini is a good tactician, he elevate Atalanta to be a tough team and have an attractive gameplay throughout his coaching career at Atalanta.
Despite they have won a european trophy, Atalanta still need to have improvements. They have capability to compete for the title race next season, if they are able to maintain their form with some improvements. Winning the Europa League trophy can become a morale booster for the players, I hope they will enter next season campaign with confidence and compete for Scudetto.
But I don't think that Atalanta is all that rich and they are not really one of the top addresses in European football. It's quite unlikely that they will be able to improve their squad by a lot. I guess they will be one of the teams that most likely get kicked out during the group stage in the Champions League. But who knows, I might be wrong though. I wouldn't have thought that they can beat Leverkusen like this. They were super efficient with their chances given that they had so low ball possession. Leverkusen played the game and Atalanta scored the goals.
But I guess if they were to repeat that game a couple of times, Leverkusen would win more than they would lose. It's not like that everyday when a team has 33% ball possession and literally destroys the opponent with three goals. Still hard to believe that Leverkusen couldn't even score once in that game. If they didn't lose that game, I guess it would be the first time ever that a team managed to not lose a single game in all three competitions.