new game plus is no longer available for my file with 300+ hours on it (PS5)

[orchid hinge]

I’ve loaded up the game for the first time in a couple months. I recently played the Tower Raid beta and now I want to restart with my acquired assets but don’t have the option. I’ve one more story mission left (The Colonel) but want another straight play through opposed to picking up where i left off

[echo thicket]

Can't do that till you finish the entire story ng+ won't unlock