The Champions League will be more difficult than the European League, which requires Sevilla to prepare as well as possible so they don't become a team that only complements the Champions League. They are a strong team in the Europa League, many even say they are the kings of the Europa League. They should be more motivated to become a team that is not only called strong in the European League, but also in the Champions League.
It's okay for Sevilla next season, even though they are playing in the UCL, but the knockout phase will continue in the UEL. Not condescending but Seville is as if the mascot is UEL. Sevilla can't compete in the Champions League with the existing squad, they can't even compete in La Liga. It must be admitted that Sevilla King UEL, even though they cannot compete in the UCL, remember that any team that enters the European league Sevilla will beat it.
Usually Sevilla will only be able to finish in third place in the group stage in the Champions League and thus, Sevilla will return to play in the Europa League. But yes, if in the Champions League next season Sevilla are able to finish in first or second position, then of course Sevilla will continue to the last 16 in the Champions League. But, because so far even though Sevilla has managed to get a ticket to play in the Champions League, the reality is that Sevilla ends it more often in the Europa League and this happens very often or is experienced by Sevilla very often.