I agree with you that elections are not won or lost on election day. But where is the evidence that SJWs single-handedly alienated the American electorate? There's stronger evidence suggesting the effect of SJWs has always been negligible, like a missed call early in the Knicks' Game 6 blowout of the Celtics. Nominating Hillary Clinton, allowing Biden to run for a second term, muscling out anyone with political instincts in favor of fossils because "it's their turn," and listening to malpractitioner Beltway consultants, those things absolutely eclipse the impact that gender studies blowhards could ever have.
The Democrats haven't figured out how to address resentment, which was the fuel of Gamergate and is now the fuel of MAGA. It doesn't take much effort or intellect to conclude that young men are prone to resentment and especially vulnerable to messages that validate those feelings. Once you understand the strategy the playbook comes into focus, and damn it's a remarkably flexible playbook. Whoever the audience is (maybe it's nerdy guys, maybe it's athletic guys) figure out what their insecurities are and craft an explanation for those insecurities in which something unfair is to blame. For the nerds, it's unfair that women will never pay attention to you. For the jocks, it's unfair that society scolds traditional masculinity.
No matter what's going on in your life, even if you're a trust fund kid who always gets laid, you're the victim. Something unfair happened to you. And we (the content creators shoved onto your feed by dark money) are the only ones brave and perceptive enough to acknowledge this injustice.
That's how you convert resentment into a captive audience. After that, the media diet more or less takes care of itself. Steven Crowder, Matt Walsh, Andrew Tate, whoever it is, they present information through the resentment narrative's lens, which reinforces their common values and builds communities on a sort of in-group loyalty.
The reason I bring all this up is that, even if SJWs had never existed, the playbook is extremely adaptable. Like a MacGuffin, it doesn't actually matter what the social circumstances are, a resentment-based political movement will find a villain and craft a narrative around it.