In the second leg, I'm still quite confident that Barcelona at home will be able to beat Napoli.
the main reason is quite clear, even though they are both going through bad times, Barcelona is still better, currently retaining Xavi, who has experience in managing Barcelona in the UCL.
Xavi could pressure his team to play optimally against Napoli in the second leg, as long as they maintain the performance of every player currently available for this match, forget about the Laliga domestic league match because of course Barcelona will also find it difficult to win the Laliga title this season, so They should focus on the second leg match against Napoli, playing at Barcelona's home ground, it should be easy to win and Xavi can prove to all supporters that Barcelona still has a chance to win the UCL title.
I know there are still many difficult matches that Barcelona will face. This is the challenge where Xavi can prove to everyone that Barcelona is not dead and they can rise from adversity to become a great and strong club. I also believe that Barcelona can overcome Napoli in the second leg. Napoli actually didn't play very well against Barcelona, Xavi has to apply the right strategy when facing Napoli later, my prediction is that Barcelona will win narrowly against Napoli in the second leg.