Barca will still need at least 2 more seasons to get back on good form. They have problems in every department. They lack a good striker. They don't have a well-experienced midfielder who can dictate the game. Busquets is getting old and so is Pique in defense and Umtiti is out of form. Ter Stegen is also not so good as he used to be at a time. And an unfortunate result from ATM. Hope they can fix their mistakes and get back to the top 4 again.
I'm not sure it can be, 2 seasons maybe Barcelona still can't get back to their best performance. Also, Barcelona still have to recover their finances, so Xavi can't make the signings of players as he wishes at will like when Barcelona were under Pep's control, Pep are free to buy players as he want. But for Xavi, he has to think hard to choose quality players, but not burden the finance and this is not enough to do in 1 or 2 seasons.