How do you care for sensitive skin?!

I'm a teenager.

I'm posting this because my skin seems to be getting worse lately.

I need to take my graduation photos this year too, so my skin needs to get better quickly.

I thought it would be, but it stayed the same. ㅠㅠ

I am currently only using Innisfree skin lotion.

What should I add?

I really want to get rid of my blackheads and redness.

Skin condition

- Flushing

- Blackheads, pustular acne, sebum