Reboot the project again, like in 2001.
Nobody wanted to use the original open source Mozilla browser because it was a weird groupware suite monstrosity derived from Netscape's code. A few clever people created a standalone browser using the Mozilla engine and called it Phoenix. It was eventually renamed Firefox in 2004.
Start another Phoenix that focuses on being a better, slimmer, faster browser than the Chromium ones, just like the original was a better, slimmer, faster browser than the Internet Explorer monoculture.