Since Sevilla got rid of the more favored team, it's only natural that they become another favourite, even though in the domestic league they are far from what was expected. Juventus must be careful with this team, because Sevilla can surprise them at any time. Manchester United were their victims before, although that was supported by Manchester United themselves who did not perform well in that match and made many mistakes.
Juventus must have seen who their opponents were in the semifinals of the Europa League and Juventus have also never underestimated any opponent they have faced so far. And of course Juventus will be very careful with Sevilla because every team that has entered the semifinals in a competition like the Europa League must be considered good because each of them certainly has advantages. So you should be careful and there is no reason to underestimate it.
These two teams already know their respective strengths because this season they have also met 2 times in the Champions League group phase and it is clear they are aware of what they have to improve.
But indeed on the other hand, things like this are still a little difficult considering as you said the conditions in the group phase and now the semi-finals are clearly different and of course this will be like a final battle because they are both aiming for victory.