Looking at the Seven of Cups as a card to interpret for the "accepting" aspect, this suggests that you recognize the opportunities that come your way and that you may be able to seize those that will be more successful. This means that you have to consider all possible choices and then select the right one. The Seven of Cups also requires you to be flexible and ready to change course when necessary. It also means you have to accept the fact that you can't always be right or control everything. You must be willing to learn from your mistakes and learn from others around you. Furthermore, the Seven of Cups also requires you to believe in your abilities and potential. You have to believe in yourself enough to make bold decisions and be willing to accept the results, even if they aren't always as expected.
Viewing the Four of Cups as a card to play for the "reject" aspect, this suggests that you need to pay attention to your priorities and not allow unnecessary distractions to distract you from your goal. You need to know when to say no and set boundaries when it comes to engaging in new activities or projects. Furthermore, the Four of Cups also involves stepping back when necessary. In other words, you need to know when to stay away from situations or people that aren't beneficial to you. You must be willing to give up the idea of doing something if it will interfere with your mental or emotional health. Furthermore, the Four of Cups can also indicate the need to take a moment to think before acting. It means taking time to think about the consequences of your actions before making big decisions.
Bottom line, your question "What are my future strengths that I should leverage?" can be answered by considering the interpretations of Accepting and Rejecting with the cards Seven and Four of Cups. The answer is that you should accept the opportunities that come your way, but only if they are well thought out; you must also learn to reject things or people that do not benefit you personally or emotionally and take a moment to reflect before making important decisions. To develop yourself personally, you must be ready to take on challenges, learn from your mistakes, accept the consequences of your actions, and set boundaries when necessary to put yourself ahead of others.