flicker (no presets) || after effects tutorial

How to make your video flicker in after effects with no presets!
Please tell me in the comments if theres something else you want a tutorial on!
My sosials:
Tiktok: / multileditzz
Instagram: / multileditzz

[@xtnzs]

thx

[@nlywitch]

thanks!! for me, the "edit expression" didn't show up though. if it happens to someone, you just have to click on alt on your keybord, then left click on your mouse where the clock is (next to 'opacity')! the pannel will show up. hope this can help!