Barcelona back line was quite fragile last season, they didn't have players capable of breaking attacks from opposing clubs, so they conceded more than 35 goals, but it seems that wasn't Barcelona's only weakness last season, since Messi's departure. Barcelona seems to have lost their best game, even though the composition of the players was not that far before Messi's departure, Messi's dependence on Barcelona was quite visible after his departure, Xavi had a tough task, rebuilding this club to get back on track
Messi is already at the peak of his career and now he will soon be enjoying retirement so I think after this xavi can talk to messi to become his coaching partner so that it can lighten xavi burden to form a tough player again, so far there is not the same skill as the former legend. there is no other choice but to form a new one because if Barcelona buy players it will make your finances swell and will definitely be a problem again.
To be precise, Messi has already passed the peak of his career as a footballer, now he is enjoying the final moments of his football career with PSG. Xavi interest in bringing Messi back to Barcelona is not as his partner on the touchline, but Xavi wants Messi back in the Barcelona squad. I think Messi will fulfill Xavi request to return to Barcelona after his contract with PSG expires. Maybe Messi can't play like he used to because he's old for a footballer standards, but Messi can help other players and increase the confidence of players to give the best for their club.