I just spent some time with the save, and here are my thoughts:
Core cities should build Infantry after completing builds to bulk up our Western Defenses. Epsilon Eridani, Mighty Bulwark, Immortal Keep should all build Infantry.
Argyle's Watch and Dune should build Frigates. We lost 3 ships in the Innovian counter-attack, so we need to start to bulk back up.
I'm very concerned that Piffle could attack us from the east, landing on the eastern shores of New Epsilon. That sea is very small, and we have no spotters. Even if we did have spotters, we'd likely only get 1 turn of warning. Granted, their main Flotilla is still in Brilliant, but we have to be defended wherever they may strike. So I proposed we ask Piffle to if we can sail SupportShip through Chappaquiddick. This will give us a spotter in that sea.
Aloha has a Frigate inside our Cultural boundaries near Icy Redoubt. He must be asked to leave.
Tech:
We are about to complete Industrialism. Where do we go from there?
If we are concerned about war weariness, it might be smart to pick up Fascism. Mighty Bulwark can complete Rushmore in 2 turns!!
Plastics will complete in 8 turns, (7 with no cash leftover); Artillery in 4.
If we're worried about Piffle attacking, then we should do Plastics. If we're worried about Aloha attacking (I'm not) then we should do Artillery.
Anyway, it looks like Innovia shut off research and is upgrading units like mad. This is going to be a long hard slog.