Chance Me

Hey I’m junior in high school.
So this is my situation:
I have a low gpa and if I get straight A’s i will have like a 3.4 UC gpa.
My first SAT score was 1680 but my second is 2300. I know big jump.
And my EC are: Music (10 yrs) a few clubs at school and choir at school.
but no leadership position…
Volunteer: 100+ as of now
AND! i have a D in chem Honors last year first semester and I am planning to make that up this summer.
So I always wanted to go to UC davis…i know its a major reach but i am a good student. i used to get straight A’s but with a family situation my grades really got impacted. so what should I do before senior and apps come! and what can improve my chances at UC davis?

Thanks