The Three of Swords indicates a blockage, a situation where you feel oppressed that prevents you from moving forward. It could be some kind of fear or uncertainty about the job offer, as if something is not clear. This blockage can also manifest itself as a lack of self-esteem or an inability to make decisions.
The reversed King of Swords indicates that the solution to this block is related to authority and power. It is only possible to overcome the blockage by taking responsibility for one's life, making decisions independently and without hesitation. Furthermore, this card suggests that one must be aware of one's own skills and competences in order to face the inevitable difficulties that will arise along the way.
The two papers analyzed suggest that there is a block in accepting the job offer, but also that it is possible to overcome it by assuming responsibility for one's actions and relying on one's abilities. The answer to the question is therefore YES, it could be a lucky opportunity if you take the right steps to overcome the blockade and leverage your skills.