Transferring to UCB/UCLA tips and advice??

I wanted to transfer to UCB/UCLA as an International development studies major and I wanted to know what my chances were and any tips/advice to increase those chances. I have a 3.5 GPA, my AA and AS degree as well as IGETC completed, and I am planning to volunteer at a refugee camp in Turkey personally, but could be used as an extra curricular volunteer experience. Also planning to help with my local campaign for the 2019 election. However, I do have one or two failed classes which were removed from my gpa (bless academic renewal) but I haven’t completed the classes for my major yet.

you can play around with this website, which allows you to see transfer admit rates. You can filter by UC school, by historical year, and by major.
https://www.universityofcalifornia.edu/infocenter/transfers-major