I love BiTW, Think it's the best song on 2020 by a mile. That being said, I don't think it's fair to say that there is only one song that is the best they've done since These days. I can think of many amazing songs they've put out post-These Days:


Real Life
Next 100 Years
Just Older
The Distance
Undivided
Right Side of Wrong
We Can Dance
Satellite
Open All Night #2 [The Box Set One]
Bells of Freedom
Welcome to Wherever You Are [Yes, I know a lot of people don't like this one. But it's always been a fave of mine.]
Last Man Standing
Have a Nice Day
Dirty Little Secret
These Open Arms
(You Want to) Make a Memory
Any Other Day
Lonely
Walk Like a Man
Love's the Only Rule
Superman Tonight
When We Were Beautiful
Learn to Love
Room at the End of the World
The Fighter
With These Two Hands
Into the Echo
A Teardrop to the Sea
Blind Love
Fingerprints
Who Would You Die For?
I Will Drive You Home
Luv Can
Blood in the Water

That being said, my all-time favorite song released by anyone in the Jovi camp post-These Days is Richie's "Seven Years Gone".