They have definitely found their way back into higher quality soccer that they are usually able to play. The beginning of the season was a horror for them and if you have a start like that the confidence is also starting to shrink from one game to the next.
Yes, thankfully they found their way back so well that they seem to be able to make an epic comeback before it's too late. And of course they won the European league, isn't this a pretty drastic progress for them. However, next season is always waiting, whether they can really rise and become big again or not, because of course there will be many more challenges. And they have to find good players again who are suitable to be able to rise.
They have a number of additional options now due to their qualification for the Champions League. But when they struggled so hard for almost a whole season and only managed to turn it around towards the end, that doesn't also mean that they are Champions League ready and also ready to simultaneously deliver in the Copa del Rey and in La Liga. As great as the qualification is, there are reasons that this season didn't go that well. That need be fixed before the new season can actually really become the adventure they are now looking forward to. But they are the deserved winner in my opinion for a couple of reasons. It was a very fair game played by them and with that little bit of luck they took it home. A great team that is very grounded and was ready to deliver a great fight and put in all the effort.