Voluntarily disenfranchising yourself is complying in advance.
A broken tool still has its uses. A bent screwdriver can still be a prybar. A rusty sword can still kill, so don't ask people to drop it before have something better. It is possible to explore and acknowledge the failures and limitations of a system -- and to reduce overreliance on it -- without abdicating all influence over it.
The Democratic Party is a disappointment. They follow popular (polled) opinion rather than sticking to principles, and that makes them vulnerable to Overton shifts. As public opinion towards trans people has been poisoned by the Jugendverderber libel, Democrats have largely thrown trans people under the bus instead of fighting back. Likewise, Democrats stick closely to corporate interests because money is power. These issues may never be fixable.
The solution to this is not to capitulate and discard what political influence we still hold.
The first half of the solution is to primary the hell out of Democrats. A left-wing caucus within the party could easily tilt things in our favor, just like the Freedom Caucus tilted the RNC in the opposite direction once before. Bernie Sanders (link) and David Hogg (link) are now spearheading multiple campaigns to do exactly that. Even if you have no faith in your ability to change the norms of the party, just think how much impact your resistance could have if you held an office, even a low one, even for just a week. Do you have any idea how much trouble a county clerk can make?
The second half of the solution is to build solidarity-based power structures outside government to reduce overreliance on a broken system. Economic desperation, social isolation, and cultural "other"-ing make people easy to exploit and oppress regardless of the type of government, so attack those problems directly. Unions, mutual aid networks, churches, you know the drill. Put in the legwork to find them in your area or your profession.
Embrace nuance. Embrace diversity -- even political diversity. Political beliefs are not sacred, but the lives under those political systems are. Don't try to reduce the vast complexity of politics to 120 characters. Don't treat the ongoing wellbeing of human beings flippantly. If you think the problem is the existence of a state, then say so, but make your case for why making the state worse makes conditions for its subjects better. If you think voting third-party will teach the Democrats a lesson and drag them leftwards, then make your case and acknowledge the risks of what happens if you're wrong.
Don't just ridicule every positive effort you see. Doomer trolls (or cuckoos, if we're going with that) are pithy, but reductive, and their criticism is never constructive.
Touch grass, if you will.
I remember years ago watching a video -- I desperately wish I could remember the channel -- where the author shared his experience with depression and the early days of 4chan anime forums. He found it easier to browse forums about anime than to go out and actually watch them. Then the negativity piled in. That anime you like? "It's shit." Any hint of optimism or passion was an opportunity to get a rise out of someone or smugly ridicule them. The only unassailable belief was to doubt everything. The only winning move was not to care.
I've been thinking about that video a lot recently.
Online activism has led to a handful of noteworthy victories. But the ease of online activism has also made people (myself included) rely too much on it, and get disillusioned by it, as if we've forgotten that online activism is pointless unless it leads to real-world resistance.
I don't believe doomer trolls are right-wing plants (though I acknowledge it's a potential avenue of attack in the future). I don't think they usually have ulterior accelerationist motives (though I have spoken with a few). I think for the most part, they're just people who've given up, or otherwise mistaken cynicism for maturity, and seeing anyone else expressing optimism or trying to organize real-world resistance just pisses them off.