Is $400 on retainer too low?

Inbound client asked if I’m willing to be an editor for multiple instagram accounts.

$400/month (per account): -2 videos a week (8 reels a month) -each video no more than 15 secs -footage is sent to me already color graded

They’re asking if I can do 8 account. (16 reels a week)

$3,200 a month for some reels doesn’t sound bad but after breaking it down, it’s $50 a video.

I could be over thinking it but what do you guys think? Would you take the job?

Oh and I’ll only be using CapCut because they really just want short trendy content.