mellow out
Upper Intermediate (B2)informal
Become calmer, more relaxed, and less intense — either right now or over a long time.
"You need to mellow out — it's just a game, not the end of the world."
Hear it in context

Conan Takes His Staff on a Shopping Spree | Late Night with Conan O’Brien
Conan O'Brien · 4:51
Get you to mellow out.

A Dark Fantasy Audiobook: Reborn With A Divine System And Hidden Power (Book 1-4) | Complete Series
NoirCast · 62:32
Judy seemed to mellow out a bit more.

You're Doing It All Wrong - How To Make Your Own Mustard
Chowhound · 9:39
Definitely letting that set mellow out that bitterness.

Distilling The Ultimate Beginners Bourbon (Safety Net)
Still It · 24:21
to mellow out as well you lose the nose that's

You're Doing It All Wrong - How To Make Your Own Mustard
Chowhound · 4:21
let's let this set up and it may mellow out the bitterness.