Bring him back, he never should've left
Coaching is a grind, and Juve did Pirlo a major disservice hiring him with zero experience. He should have been coaching the U23 team and learning on the job with no pressure for a 1 year or 2, before making a job to a Serie B caliber team and work his way up to a legit coaching job.
After coaching Juventus for 1 year, where do you go from there? In Pirlo's case, he did nothing for a year and then went to Turkey. He's really in no better position today than he was 4 years ago.
If Pirlo is serious about being a coach, and is in for the long haul, he should try to get on Conte's staff as an assistant for his next job. Do that for a year or 2 and then move back on and try to get a job in Serie B, and start to build a resume. Would Pirlo's ego allow him to do that? I dont know
If Pirlo isnt willing to do that and is looking for a good job in a top 5 league, he's probably going to be disappointed.... and will probably be better off doing what most other rich and famous retired athletes do, which is live a stress free life and pick other projects that interest you.