At your age, there is not plausibly much to say.
Think holistically about your personal development over the next few years, if you are interested in applying to holistic review US colleges.
When the time actually comes, be open-minded about what US colleges might be good fits for you.
And if you are interested, start looking into how recruiting for fencing would actually work, consulting with the people who really know about that topic.
It is just too early to get more detailed than that.