Why not use her to take the place of whatever decommissioned carrier we were using for training naval aviators? Damned if I could remember her name now....
You would have to upgrade the ship to modern traffic, landing and takeoff systems to make the training worthwhile, which would be about as expensive as a new carrier. See above posts about how hard and expensive it currently is to keep the ship going let alone upgrade it.
USS Lexington (CV-16), built in 1942, was the training carrier until 1991 - but it was an oil-burner and carrier tech didn’t change all that much in that period. Forrestal (CV-59) briefly was used as a replacement but that ended in 1993. For the last two and a half decades, the Navy has just used whatever carrier happens to be in the area for carrier training and SNA quals. The Navy has demonstrated that they don’t need or want a dedicated training carrier.