Espanyol is a Spanish football club that has won numerous domestic and international titles, including the Copa del Rey and La Liga. The team's tactical shift from 4-3-1 to 5-4-1 in recent years has been a significant improvement for Espanyol.

The move from 4-3-1 to 5-4-1 was made as a result of the team's performance on the pitch during the 2018-2019 season. In this season, Espanyol struggled to score goals despite their strong defensive efforts. The team's lack of goals allowed opponents to easily dominate the game, resulting in poor results at both home and away matches.

However, with the introduction of the new tactical system, Espanyol saw an increase in its defensive performance. Under the new system, Espanyol managed to score more goals than usual, which helped the team to improve its defense and gain some respect from opposition teams.

The tactical shift also had a positive impact on Espanyol's overall performance off the pitch. The team's improved defensive performance led to a stronger squad, which gave them better chances of winning matches. This increased Espanyol's chances of qualifying for the Champions League and other major competitions.

In conclusion, the tactical shift from 4-3-1 to 5-4-1 by Espanyol has been a significant improvement for the team. It has helped Espanyol to improve its defensive performance and gain respect from opposition teams. With continued improvements in the team's performance, Espanyol can aim to qualify for the Champions League and other major competitions.