Ships which launch rockets. And room for a helicopter.
The day of massive warships firing 16” shells is past. What the Navy needs is many dozens of medium size ship, like a WWII light cruiser, bristling with ship killer missles.
These cruisers proved their sea-worthiness, and with a plethora of missle launchers replacing very large triple turrets, its fire power and targeting range would be awesome.
Add a fantail with a copter pad (or 2) and there would be a capable fighting ship at a low cost when compared with the price of a single super-carrier.
With the fitting of shorter range smaller rocket launchers the Navy would have a serious Anti-Aircraft ship which could do screening duties protecting the large carriers.