It buys us time to elect a party capable of making good changes. As long as a conservative or centralist government is in power I would agree with you that the root causes will not change, in fact with Friedrich Merz and the grand coalition things will get worse faster. But if we can buy the population some time not going fully into fascism we can hopefully point to the decline into fascism brought on by the CDU/SPD/FDP and elect politicians that actually care to serve Germans.
I think it's important to treat the rise of fascism, the growing wealth inequality, the new wave of media, as a flu we have to fight but also get through. We need to build up anti-bodies against these things. That means taxing wealth, strengthening unions, breaking up monopolies, etc.
I think in the US we've seen a small rise in characters like Bernie pulling in new blood along the same ideological lines like AOC which didn't feel present 20 years ago. I also think Obama's tenure was sold to the public as a period of progress and change and I think in all actuality whatever good it did it wasn't enough to steer the boat. To me that was the sign that the US was likely too far gone from a political standpoint to recover. BUT if there is a chance, I think the past 25 years have been a clear enough signal to me that things must drastically change for things to get meaningfully better. Trump is the dark side of that "drastic change" coin and we've yet to see what the good side looks like but I would argue the US is running out of time to figure out which side of the coin is going to come up the winner.
Britain is seeing a minor rise in Wealth Inequality awareness. I think that knowledge could be the exact anti-bodies the world needs distributed to reverse this course. In Europe wealth taxes, capital gains taxes, etc are higher than in the US but still not enough. Unions are also more prevalent, at least in Germany. I like to compare it by saying both the US and Germany are on the same graph of declining living standards and for the exact same reason, Germany is just a decade or two behind the US. We still have a lot of power in the hands of the people, but it seems to me that the media is still able to whip up 30-40% of the population into being conservative despite their best interests and something like another 30% being too moderate to make a difference.
Right now we have a conservative government, things will only get worse while they're in power, but if the wealth disparity conversation continues anywhere in the world and billionaires are removed from the population, the entire world benefits. If the next progressive government enacts a tax plan like Die Linke's or takes step to removing land lords from existence or provides a UBI I think the results will speak for themselves rather quickly.
It's a big pendulum, right now in Germany and the US it's swung to the right (yours further than ours) but it all comes down to how effective the left swing can be. Take hold of all the power you can at the local level, form a union, conquer the state level offices, and educate people. That's the best advice I can give.