Only eco-ing will not make you win if the opponent is agressive enough. But to keep growing your eco is a good thing. At what pace depends on the situation.
Once you win your sea, kill what you can from there (with Seraphim, build cruisers, they shoot far inland), make sure you have enough navy to hold that sea. Colonize the island if it was not yours.
Then you should have enough available attention and eco to help your teammates.
Ahwassa's only work when your team has air superiority.
Maybe you want to spam t3 air. Or you make navy in the other sea. Or you make nukes, possibly from your battleships. Or you make Ythota's in your sea and walk them onto their land. Or you make T3 arty. Or you help building a game ender (rapid fire arty, Paragon, Yolona oss). Or you spam combat SCU's that teleport. Etc, etc.
So many options, depending on the vulnerabilities of the opposing team, the needs of your team, and your creativity.
These casts can give you ideas:
https://www.youtube.com/channel/UCkldHI ... CwsBjaygwA