Depay should have chosen a club that would give him more places in the squad. I don't know why he didn't want to leave Barcelona. because Juventus is not a small club that will be in arrears of salary. if he stays at Barcelona, maybe Depay will get very few opportunities to enter the main squad.
This reminds me of Bale at Real Madrid.
By the way a good comparison, both players are in good form at the same age, Bale has already made the mistake of staying then, hopefully Depay won't repeat it. What can be done in that case? Nothing, just train hard (but I doubt they'll put you in the main squad because there are more attractive players), or hope that his rival gets injured
Defending was not the right choice for Depay, before that Bale had also experienced how difficult it was to penetrate the main squad due to the difficulty of competing with other more attractive players. Barcelona already have Aubameyang and Lewandowski, he will be number three there because he is not in Xavi plans. I think he should move immediately to get playing time with other clubs and can get him called up again in the national squad depending on his performance with the club he plays for.