First of all, these are amazing. Congrats. And between them you have 90% of everyday use cases covered from casual hanging around to suit-and-tie meetings.
So from a practical standpoint, a hat’s missing?
Put it this way: do you ever feel like you should wear something super dressy from time to time? Or is it more shorts and a t-shirt?
If leaning towards the first (“I keep going to events where ‘tuxedo’ or ‘dinner jacket’ is requested”) , then how about a Golden Ellipse? Or something else dressy and exquisite outside the PP stable - say, a Piaget Andy Warhol, as they now call it (white gold and blue dial would fit nicely and has a slight echo of the shape of the Nautilus and Aquanaut).
If more towards the second, you’ll probably want something you can chuck about, maybe not a PP but perhaps something in ceramic (watch for hard knocks tho) or carbon fibre, perhaps a dive watch of some sort.
There’s also a third direction: you just want something new and different.

in which case perhaps some other complication is called for rather than a simple time-only watch.
Best
E.