Absolutely a keeper.
After that, depends. It's possible for Portu to go to a better team, as he is doing a great season. So we would need a second striker, mobile and fast. Aleix García can do that role, but it is not ideal. Stuani may hold another season, and we broke the bank with Lozano. So no strikers.
The midfield is complete. Pere pons, Granell, Borja Garcia, are a good combo, albeit Borja García may be the weakest link. Timor is a good backup. And we don't have any more subs, barring Douglas Luiz and Aleix García. So, substitutes for midfield are required, if this two go away.
Defense, Mojica is a good left back, and Bernardo is a ok sub. Maffeo very good, Aday pretty good too. No need for a staring rb if Maffeo don't come next season. We have decent center backs, but a good signing wouldn't be too bad. So a cb would be a nice surprise.
I hope this year in first division we actually don't change much the team.