In fact Sevilla have failed and slumped from last season but yes, last season Sevilla were still lucky to win the Europa League title so Sevilla got a Champions League ticket. But this season, Sevilla was really devastated because they were not successful in Europe and also, Sevilla failed to finish in the top zone in the La Liga table. Although indeed, there is still a second half of the season but obviously, considering the results that Sevilla has had so far this season, then Sevilla is just trying not to be relegated and that is Sevilla's main priority at this moment.
This is a difficult moment for Sevilla, of course because they failed to meet many of their fans' expectations. Sevilla failed to qualify for the last 16 of the Champions League, while they also failed to enter one of the participants in the Europa League playoffs. In La Liga they have slumped and so far are still having a very hard time getting back up, but you are right that they can take advantage of the second half of this season to get up and fight harder.
The match against Alaves was supposed to be a turning point for Sevilla after two consecutive defeats against Atletico Madrid and Athletic Bilbao. Sevilla must win its home game today and make the most of every opportunity, otherwise this will make things worse. Sevilla's chances of winning are quite high, but Alaves is a team that might need to be anticipated too.
There is no reason for now other than having to focus more on La Liga but in this match it also looks like they will still greatly disappoint their fans because playing at home at Ramón Sánchez Pizjuán with the full support of fans who are always militant but now they have to be 2 goals behind.
I don't really understand what's wrong with them in recent seasons because when it comes to performance and possession they have actually been very good but indeed the same problem always occurs when defenders who try to overlap are too often in the area often which is precisely this is well utilized by the opponent.
Likewise in this match no one doubted the possession they had because in the end it was very good but in terms of chances it was Alaves who were better off with the condition that they did not get the ball well during the match because it was always controlled by Sevilla.