What do i add on?

Ok, so im a sophmore in high school, about to start second semester, and i was wondering what i need to add on to make a good college app. Here’s what ive got:
GPA of about 3.6 both last semester and freshman year (hoping for a 4.0 this semester) I havent taken the ACT, SAT, or SAT 2 yet. Im in all advancewd classes and a couple of ap ones. Starting next year all of my classes will be ap.

In school: I do tennis (even though I don’t think i will ever get on varsity cuz im not good enough and the varsity time commitment thing). Im also in Net Zero (but not very active in it- im gonna change that). I’ve also started a club

Out of school: I do yoga classes (if i should even put that on?) and i volunteer as a tutor for middle schoolers once a week. Im trying to add on humane society. I play piano (not very well, again hoping to improve on that) and a traditional language. I’m also bilingual and i can read and write in that language (the characters are different than the english characters). Im also hoping to teach myself a traditional instrument. My current job is working in a traditional school run/ founded by my mom (would this make it any less significant?)

This summer I’m hoping to get a job as a summer tennis camp counselor, get an intership with my vet (cuz i wanna end up being a vet), take a programming and physics class and do a summer college thingy, as well as travel to a foreign country (just for fun)

Starting next year, I want to get a part time job during the weekends (so it doesn’t interfere with extracurricular stuff)

So if i do end up improving on all the stuff i said i would, what do i need to add to make a stronger application?
(thanks for reading this lol)

The most important thing you can do is to get your GPA up. Worry about your grades FIRST. If you’re certain that you have your GPA taken care of than I would recommend continuing with music or sports (try to win a few rewards in them if you can). Join school clubs and try to become officers in them, and then participate in whatever internships or extracurricular opportunities you can get your hands on. Also, prepare hard for standardized tests.