The 3 of Cups is often considered to be a card of "reunions." But this is not always a romantic reunion, alas… it's reunion in the broadest sense, running back into (or meeting with, purposefully) someone or something that you have been away from for some time. It's generally considered to be a happy reunion, an upbeat card.
In general, things should be going well. You can look forward to at least one pleasant reunion with someone or something that you have been apart from for some time. It also can mean celebration – your own or someone that you care about - such as the celebration around a new baby, wedding, or other happy occasion.
Career & Employment
The 3 of Cups is also a good omen with regard to work. Money should be coming in, you could be coming into a new job and/or a promotion. The mood in general in your working world should be relatively pleasant. If you are looking for work, you should be quite successful (perhaps surprisingly so) at how well things work out for you. So don't give up.
Love & Relationships
Although this card can mean a reunion with a lost love; it does not always indicate that. You must look carefully at the rest of the reading in context, to decide whether that interpretation fits. If you are single, the most likely interpretation is that you will meet a likely love soon - someone who really "fits the bill" of the person you are looking for, and that this person will be a new love, not someone you "used" to be with.
Finances & Income
This is an important time to not be too attached to money. It will be flowing in fine; but may be going out just as fast or nearly as fast. It's important to know that this is an abundant universe, that your needs (financial and otherwise) will be met, provided you play your part.
Mental & Physical Health
This is a great time to consider what you are doing - and perhaps should be doing - to increase your health and vitality. Do you need more exercise? More rest? Think it through, and come up with a game plan. You can do better - if even only slightly - than what you are doing right now.
It may be important now, particularly if you usually attend to your spiritual side in solitude, to reach out to others. This can lead to a spiritual awakening. Think about whether or not you have need of a "spiritual teacher" (in the flesh) and if you do, seek one out! This can be any sort of trusted counselor, not even necessarily someone who identifies as a "spiritual leader."