Is it possible to “heal” accounts

So I am struggling with the following: I am pretty new to caring for clients accounts.

I have one client with nearly 32k followers. He is still using a web based service.
Like-Rounds, f/uf, liking, commenting the whole programm.

So he wants to quit that and “heal” the account.. I am
Kinda lost.

His average likes are between 2500 to 3500. He wants me to take care of his account. How the heck should I make sure to reach his ER? By not being spammy?

Phlanx tells me he has over 90% real follower. Don’t know if I can trust on that.

Stop the f/u, liking, commenting, etc.. for at least 72 hours. During that time manually post content, manually leave a few comments, send some DMs to friends, etc... After the 72 hours slowly start bringing back the automated f/uf, likes, etc... Start at 50% of what you were at before, do that for 7 days, and start to scale back up. If any time you feel like the account is struggling again, start over. 72 hour stop, etc...

Thank you!!
Would you suggest the Master/slave method during (and after) that time to reach his former like average?
I am worrying about not reaching the average.