The possibility of Girona having a good performance like they did last season depends on the ability of their management to retain them old players no doubt this will help the new players to adapt faster with team and form a stronger squad better than what they had last season but right now they have brought in some good players which is indeed a welcome development but they shouldn't allow their players to leave the team especially their striker Arthem Dovbyk who was an instrumental player last season, they need to convince their players to remain in the team because the new players will not easily get adapted to the team and it will affect the performance of the team next season especially now that they will be playing in the champions league next season.
I agree with you, what made Girona good last season was their solidity in playing as a unified team, so if they can keep it up, or even get the support of new good signings, they might have another good season. This will be Girona's first experience playing in the Champions League and I don't think they should have high expectations in that tournament because that will actually prevent them from playing with optimal performance.