You may find this article helpful in why it still matters:

“My country’s emissions are so negligible, it doesn’t matter what we do. It won’t make a difference”. It’s true: the emissions of many countries in the world are completely dwarfed by a few big players. We see this in the chart below. But there are several reasons why rich countries with ‘negligible’ emissions need to step up to the challenge. What they do does matter.

https://open.substack.com/pub/hannahritchie/p/small-emitters

Individual actions, while inconsequential, can help signal the market ( eg demand for ev infrastructure) and can add up when combined with federal regulations.