I think a strong understanding of Marxism helps seed the revolutionary optimism that makes watching the news more bearable than for liberals who see the world as a scary swirl of chaos and no way out. Lenin says it well:
Despair is typical of those who do not understand the causes of evil, see no way out, and are incapable of struggle.
This fits the liberal nihilism to a T.
The DNC and GOP are not hostile factions, but different wings of Capital. Organizing goes a lot further than random collective actions, but the tedious work of building organized structures, party building, doing the groundwork. We need to study former successful revolutions like the Russian, Chinese, Cuban, Vietnamese, etc and adapt what we can apply to our revolution. Parties like PSL in the US are already doing that, and are rapidly growing because they are at the forefront of resistance movements.