The Emperor reversed shows a situation where it may be necessary to accept significant changes or losses. This card can also represent a need to change one's habits or give up the control one has over the situation. It may indicate that important decisions need to be made, but that you are still capable of handling the situation. The King of Pentacles shows a person capable of making important decisions and solving problems. It can also indicate that you are ready to accept the consequences of your actions and that you are prepared to do anything to achieve your goal. The combination of these two cards suggests that if you've worked hard and are prepared, you can confidently tackle whatever you're faced with and can achieve your goals.
The Emperor reversed can also indicate that the person has lost control over the situation, is not ready to deal with it or is not making the right decisions. The King of Pentacles can indicate that despite all your preparation, there is a change in the situation that you need to consider before making a final decision. Together, these two cards can mean that you should take your time before committing anything, because your decision could have negative consequences if you haven't considered all aspects of the situation.
In conclusion, the cards indicate that your decision about promotion will depend on how prepared you are and how willing you are to accept possible changes in the situation. The tarot suggests that you should take the time to think through all aspects before deciding whether to accept or decline the promotion. Given the tarot cards, the most likely answer is No, you shouldn't immediately accept the promotion without considering all the factors involved in the situation.