I am also very confused about what Sevilla has experienced since last season until this season, because when Sevilla managed to get the European League trophy last season while their local league was not good enough it raised big questions. So it is quite possible that this is due to the departure of their old coach, Diego Alonso, and at the moment Sevilla seems to have really sunk to the point where it seems quite difficult to recover from their bad results so far.
IMO, there are many factors that cause this and one of them is that the Sevilla players are not playing well. Moreover, as far as I know, this team always relies on players aged 30+, some of whom are Rakitic, Sergio Ramos, Acuna, Jesus Navas and Nemaja. for some of the young players they have, they don't really stand out in their game, talent and skill. so it's natural, if the results are like what we see now. If I can be honest, based on my personal point of view, the Europa League trophy that Sevilla won last season could not be separated from luck, they were lucky with an ugly win and were able to win the title in the Europa League competition. Coincidentally, their opponent in the final was AS Roma. at the same time, Sevilla was only able to finish in 12th place last season. this season, their performance has really underperformed. in fact, Sevilla has tried to replace three coaches. the fact is that they have not experienced an improvement in their performance or ranking on the standings, especially now that their position is in danger of dropping into the red zone. this shouldn't be a coach problem, in fact Sevilla has replaced 3 coaches in half a season, please correct me if I'm wrong. IMO, the problem is the players. in fact, Sevilla does not have sufficient player depth to be able to compete competitively.