Feel free to cast your individual vote for Dems if it makes you more comfortable. It doesn't really matter and there's usually no meaningful choice anyways.

But if you're spending any other time trying to support them, like joining the party or going to some protest that accomplishes nothing or trying to convince others to do so, I would recommend taking that energy and putting it into left organizing as part of a local leftist organization.

Our power as the working class is actually rooted in collective action, including labor actions to withhold labor, to disrupt capitalist structures of control, to shut down infrastructure, to demand attention for our causes. There are many more of us than there are in the ruling class (the class that controls the Democrats), but we fail to realize our power because we are disorganized and full of false consciousness about how the world operates. The reason the ruling class wants you to focus on bourgeois electoralism is that it is no threat to them. Being embedded in the work that is or becomes a threat is much more powerful. You'll find that you punch above your weight (in power) in a competent left organization, way more than any Democrat activity ever offered.