The King of Cups represents a situation where you are blessed with success, friendship and pleasure. This card also symbolizes generosity, attention and kindness. The King of Cups is a symbol of skill and competence, so it indicates that you are able to handle difficult situations and accomplish your goals. Furthermore, this card also shows a strong sense of security and self-confidence. This means that you are ready to face the challenges that may arise in the promotion offered by your boss.
The reversed King of Wands shows a situation where rash decisions are being made or wrong actions are being taken. This card can also indicate that you are not taking your current circumstances seriously enough. This means that your boss may not have considered all aspects of the promotion before offering it to you. However, this card can also indicate that you need to take decision-making a little more seriously and make sure that the promotion is truly what you want.
In conclusion, based on the interpretation of the tarot cards, it seems that the promotion offered by your boss can bring good luck. However, it is important to carefully consider all aspects before deciding whether or not to accept it. Yes, this could be a lucky opportunity for you but it's important to do your research before deciding.