Xavi's achievements with Barcelona this season are quite good. Even though he didn't manage to get 1 trophy but he has managed to lift Barcelona from adversity. I think if he coached Barcelona earlier, then Real Madrid would find a formidable competitor in the fight for the La Liga title. Everything has indeed passed and it can no longer be played back, but for the next season, I think Barcelona will come back with their confidence.
Barcelona looked like they would literally miss out on champions league, when it was managed by Koeman they were 9th in the league, and not like they fired him on the first few games, it was 10+ game into the season and that is a big trouble for the team. Xavi came in and took a team with 9th position and took them to second position.
So, having no cups this year doesn't matter, at least they were going horrible and instead they managed to get the team to the second position which means a lot for them for the future. If they can handle the financial troubles then they will be able to get some more people and they will be able to get a title finally. But even Xavi can't get anything if they do not handle the money situation.