Apart from not needing to throw away the old players that Atalanta already has this season, the Atalanta team itself also needs to look at other players who are much better if they have enough funds to buy new players so they can be included in the existing squad. I am also starting to be impressed with the gameplay created by Gasperini because this was very visible when Atalanta played in the Europa League this season and also in Serie A this season. Hopefully next season things like that can continue with Atalanta so that other teams don't think of them as a weak team.
Next season will be a more difficult season for Atalanta. They will play in the Champions League which is more competitive than Serie A or UEL. Atalanta needs to add several players to the depth of their squad. The current team is very good and they are the champion team because they managed to win the UEFA European League trophy. But that won't be enough for them to compete in the UCL. This reminds me of Leicester City in the 2017/2018 season when they played in the UCL. They must not sell their important players and they must look for some new players.
The Champions League is certainly more competitive than the European League, where squad depth, mentality and experience determine the fate of a team there. Atalanta was very lucky to win the Europa League trophy, and gave them two tickets to the Champions League this season. However, Leverkusen will also go there, because they are Bundesliga champions. It would be very interesting if the two teams met in one group in the Champions League, it would be an event for revenge.
It's true, the challenge facing Atalanta in the future is the transfer window, where they have to try to recruit new players while having to struggle to retain existing players, which is quite difficult to do. If you assess squad depth, Leverkusen has a better and more even squad depth than Atalanta, but the challenges they face will be the same.
Gasperini even immediately received an offer from Napoli after successfully leading Atalanta to win the Europa League, fortunately the manager chose to stay at the club. Atalanta and Leverkusen will be newcomers to the Champions League, in fact there are several other teams that also have the same status as them, such as Bologna and Girona.