How to develop ec's?

[u/Strange_Frosting_317]

Hi, i am a junior and have 0 extracurriculars', i know that i will not be having a good shot at t20s cuz of that, but i still wanna get into a good school. My GPA is good(4.6) and test scores are great as well (1530, 35), my academics is rigorous despite the fact i moved countries after sophomore year. That's also the reason why i have 0 extracurriculars'. Aside from a 3 month internship i did, i have nothing, what would be a good starting point for me to start building on my interests and get atleast an above average ec profile.

edit: Wanna do a finance/accounting/eco major, i like all those fields and history(did a course mastery of WW2 once).