This is football, anything is possible. I cannot tell Sevilla to be relaxed with second place. Sevilla deserve the first slot. If Barcelona and ATM are struggling to be in top 4 shows that many things happened in the league this season. So Sevilla winning the league will part of the joy. They should remain focused, who knows if real Madrid can make some expensive mistakes and Sevilla will emerge.
If Sevilla can win La Liga, it will be the first title which does not belong to 2 Madrid clubs and Barcelona after many years. Seasons when Deportivo la Coruna, Valencia won La Liga is too far ago. Sevilla is doing well and no one can stop them dreaming. I don't say they don't deserve the title if they can actually win it. If they succeed, it will give other clubs more belief, more motivation to fight against top clubs for the title.
I also think the the europa league is more important for Sevilla because they know how to win that title very well. This is surely a good season for Sevilla.
If Real Madrid is a giant in Champions League, Sevilla is a giant in Europa League. They have unbelievable record in Europa League. I know Europa League is at lower level than Champions League but many big clubs can not win it after relegating from Champions League. They can say Europa League is not their priority but fact is only Sevilla managed to win it many times.