[Question] Checking Ghost/Inactive Followers

Lately I've been weeding out some of the inactive accounts, and also the ones that do not engage with my posts.

It works but to a certain extent as I've been only checking them manually. I have 23k followers so it's quite difficult.

I'm looking for something that just checks inactive users, I wouldn't mind manually unfollowing them. Do you know something that would work?

I don't need Followliker or any other bots like that. As I've a specific need.