It couldn't compete. Those cars were shit, just like the Chevettes they were competing against. It was all shit. All of it. The imports were typically slightly more expensive to boot.

They sold well because you could get a Civic or whatever with a nice radio and they had a bunch of them on the lot in automatic and all the other things buyers cared about beyond just A to B because for the Japanese automakers shit was serious business and so they built their shit with some give-a-fucks included whereas to the Americans shit was a sideshow and they phoned it in and it was like pulling teeth to get a well optioned domestic that wasn't hobbled by the lack of some key feature or ergonomics issue.

None of these were cars people wanted to be driving. The market for big nice fuel hogs shrunk and the market for compacts rose in it's place and the Japanese were very well positioned to put their ass in that seat when the music stopped.