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.
Many people still can't separate domestic league from European ones. Sevilla and West Ham are not that top in their leagues at all. Sevilla finished twelve and West Ham in the fourteenth position, yet they won Europa League and Conference League vs Italian teams that are classified better than them in the ranking.
Sevilla particularly are a hard number in Europa League, they are like nightmare for the teams facing them there!
That's right, I have said many times that domestic league results cannot be a benchmark for other results in European competition. This is proven by what Sevilla got from the results of a series of European league matches this season and they managed to prove it by becoming champions again in the competition they really controlled. While West ham maybe they are greatly underestimated in their domestic league, but they came with high motivation to win the conference league and managed to beat the top team this season, namely fiorentina. So both Sevilla and West Ham both have good records in the competition and can't be compared to what they got in the domestic league.