Yea, if you want more leftist policies than right, vote and work with Democrats at the federal level and try to get Ranked voting in more places. Exactly like Bernie has. Continue to support your third party in local until they become able to actually get folks elected to even a Senate post. As long as the Green Party can’t even manage to get the most hippy district in the nation to get a single House Rep elected you might as well just cast your vote for Bob Ross.
The US has literally 0 third party representation at the federal level and 10 state senators all libertarian. Even Bernie isn’t technically a third party he just is no party. So to be clear, having no party is far far better in the US than representing a third party even in a local election.