A Villager generates new trades depending on its
CareerLevel tags, according to the wiki:
Career: The ID of this villager's career. This also influences trading options and the villager's name in the GUI (if it does not have a CustomName). If 0, the next time offers are refreshed, the game will assign a new Career and reset CareerLevel to 1.
CareerLevel: The current level of this villager's trading options. Influences the trading options generated by the villager; if it is greater than their career's maximum level, no new offers are generated. Increments when a trade causes offers to be refreshed. If 0, the next trade to do this will assign a new Career and set CareerLevel to 1. Set to a high enough level and there will be no new trades to release (Career must be set to 1 or above).
What is the the maximum
CareerLevel value for each corresponding