In his first 3 years at Barça, Frenkie de Jong went through four different coaches, sporting and economic crisis, mismanagement, Messi's painful goodbye, winning just one trophy in three years but he never gave up. Last year he rejected a move to Manchester United and only wanted to succeed at Barça.
He has fought and suffered a lot and his insistence has started to bear fruit now. He finally celebrated the La Liga and Super Cup double with full enthusiasm - it is an appetizer. Frenkie is now non-transferable for Barça and the coaches trust him blindly.