Even with their current performance, Sevilla will definitely have difficulties but I think they will be quite capable of reducing the dominance of Barcelona.
On the other hand, I agree with you, Sevilla can still come back at any time and it is possible that in this match they can do something different even though the probability of winning is very slim. I try to be optimistic that Sevilla also has players who don't give up easily.
Sevilla's performance is unpredictable sometimes they are very bad but sometimes they are also very good so in this case if Sevilla really want points and want to improve their current position then they must try to at least secure 1 point in this match.
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I think we shouldn't expect any surprises today - the Catalans will try to go forward to the opponent's goal from the first seconds. The team has a very powerful offensive line, which will allow Barcelona to realize their chances. "Sevilla" now is not a team that can cause problems to the leaders of La Liga. So I think the Catalans will get three points.