My son did not have “traditional” EC’s to list in his college application because he was home schooled in a rural area. He used his application essay to explain this, and perhaps you can do the same. Some ideas I had…
You said “I love data science.” What sparked that? Write about what got you interested in it and how you’ve been able to “feed” your interest even without access to traditional school EC’s.
It’s not too late to think of a project that directly applies to your passion. For example, you said you have a job. What kind of analytics/data would help your employer be successful? How would data science help you create better websites? This might even turn into a mini-research project for you… but even if you never get beyond the brainstorming stage, it would show that you know how to apply your interests to the world around you.
You can also look to the future. What would your “dream” EC be in college? Once you have your college list narrowed down, search for “student organizations” at their websites. Maybe there’s a club or honors program that interests you. Mention this in your essay, and why you want to join. Even if you haven’t had many EC’s in the past, you can show them that you look forward to the opportunities at that school.
Also, if you have your essay written - even just a rough draft - that could be something to share with your teacher or other person writing a recommendation for you. It can help them understand your interests and make their recommendation more personal.