I personally also thought so and indeed if several good Girona players in the 2023-2024 season are sold then it will automatically make Girona's performance decline and of course Girona will find it difficult and their performance will decline.
It's difficult to predict next season, but I hope they can still compete. I read rumors in local media that Girona are trying to strengthen the team by bringing in new players. Like Van de Beek and Gabriel Misehouy. Misehouy is a striker who can play as an attacking midfielder, midfielder, central midfielder, or even as a winger. As for Van de Beek, we know he is an experienced midfielder. Girona seems to be eager to have a lot of experienced players thrown away. This is the situation done by Michel this season.
Girona did well last season, so they ought to do better next season in order to improve their stance in the league. When they put in that effort, they saw a lot of impressive results on their end and just fell short towards the end of the season when they began to underperform. They need all the best players they can afford in order to be successful next season. The league is wide open and they can also become champions and not look down on themself. Nothing is impossible now and Bayern Leverkusen have proven that to every club in Europe. I don’t expect less than perfection from them next season. If they can’t do more than they did last season, they should not to less than that for their own.