See what you plan on majoring in college, and do ECs related to it. For example, if you plan on going into medicine it would be a great idea to shadow a physician or volunteer at a local hospital to gain patient experience. Or, since it looks like you are going into computer science (I’m just assuming), possibly create an app with the experience you have in programming.
Anything works, but what will really work best is if you show passion and dedication in a few good ECs (some of yours are great already!)