We'd dip (after killing maybe 500 ships becuase yk idk) losses being around 800 ships to 500. We'd begin mobilization and construction on our space force, giving the department of warfare another 200 Octillion in budget, and the Advanced Weaponry Research Bureau another 10 Octillion in budget, alongside another 100 Octillion to the department of advanced science. We'd build force fields all over our planets, and giant anti-ship relativistic cannons/missile launchers on planets; we'd transition to a war economy and begin building factories to construct ships, tanks, etc. And we'd call a draft declaring this a war for our survival. We'd ramp up modernization and creation projects.
