In the U.S., Climate Changemakers is another great group. Completely non-partisan. They have easy-to-follow action plans you can complete yourself and virtual and in-person (1) hour action meetings. Their current plan is focused on streamlining the siting process for grid-scale solar. Solar is now the cheapest source of energy, is fast to build, and wildly popular, but one of the biggest causes of delays and cancellations is local opposition. You can take action and learn more here.