How about taking a page from the political playbook of the U.S.'s NRA (National Rifle Association, an extremely pro-gun group in recent decades) - keep detailed records of how every politician votes (on climate laws, vs. the NRA's focus on gun laws), then zealously turn out to vote in every election? That gave the NRA political influence far beyond what their membership numbers would suggest, decades before America's current culture wars had really heated up.

Of course, that would also require some real work, and a grown-up attention span. Vs. "I scream for full gratification NOW" performative activism, which has seemed the default for kids since at least the 1960's.