Just some ideas to learn about refactoring using functions

refactoring.py

# Before
# Crédit
credit_text2 = QgsLayoutItemLabel(layout)
credit_text2.setText("Plan réalisé par le Club agroenvironnemental de l'Estrie")
credit_text2.setFont(QFont("Ms Shell Dlg 2", 11))
credit_text2.setHAlign(Qt.AlignLeft)
credit_text2.setMinimumSize(QgsLayoutSize(133.376, 8.215, QgsUnitTypes.LayoutMillimeters))
credit_text2.attemptMove(QgsLayoutPoint(6, 268.737),page=1)
credit_text3 = QgsLayoutItemLabel(layout)
credit_text3.setText("Plan réalisé par le Club agroenvironnemental de l'Estrie")
credit_text3.setFont(QFont("Ms Shell Dlg 2", 11))
credit_text3.setHAlign(Qt.AlignLeft)
credit_text3.setMinimumSize(QgsLayoutSize(133.376, 8.215, QgsUnitTypes.LayoutMillimeters))
credit_text3.attemptMove(QgsLayoutPoint(6, 268.737),page=2)

# After (could be largely improved, jus to give principles e.g reusing code with functions
def generateLayoutItem(layout, page)
    credit_text = QgsLayoutItemLabel(layout)
    credit_text.setText("Plan réalisé par le Club agroenvironnemental de l'Estrie")
    credit_text.setFont(QFont("Ms Shell Dlg 2", 11))
    credit_text.setHAlign(Qt.AlignLeft)
    credit_text.setMinimumSize(QgsLayoutSize(133.376, 8.215, QgsUnitTypes.LayoutMillimeters))
    credit_text.attemptMove(QgsLayoutPoint(6, 268.737),page=page)
    return credit_text

credit_text2 = generateLayoutItem(layout, 1)
credit_text3 = generateLayoutItem(layout, 2)