We can't judge Sevilla about their place in La Liga because they didn't focus on the league games and they didn't need the La Liga games to earn points at all in the last games because they couldn't reach the top of the table and on the other hand, Sevilla wanted to win the Europa League and they have enough hope for it because of the last wins the had in Europa League.
Sevilla is the king of the Europa League and that's why they are more focused on strengthening the team and getting more titles in the Europa League.
For La Liga I don't expect Sevilla to get better results there because instead of getting a win they will find it difficult to win and it will only affect their performance when playing in the Europa League. I think it's better for Sevilla to stay in a league they can beat like the Europa League and prove they are there.