Let's be real, this isn't about people not voting anymore.
Those of us who have resolved to vote Biden despite much of our displeasure towards the handling of Israel/Gaze were going to do so anyways. You won't convince those who have decided not to vote this way either.
Screaming at people to vote will not make them want to vote. Worst case scenario you piss them off enough that the spite vote against you. People aren't puppets for you to control by telling them what's in their bests interests and demanding they follow through. You have to work with them in a pleasant manner if you genuinely want to convince them.
But again, I don't think this is about people not voting anymore. Some people are genuinely unhappy that others are unhappy with their options for candidates. So many people on the moderate left can't be satisfied with the fact that they have such a firm grip on intelligent voters who understand the status quo. It's not enough for them to know that our options are bleak and that we have to vote for someone supporting genocide, versus letting someone who would openly participate in genocide get in office. You genuinely want us to shut up and stop complaining and to stop criticizing the current administration.
Also, the amount of people I've seen discuss implementing mandatory voting as if it wasn't a trait of an authoritarian government is insane. Maybe if our voting process had more options it wouldn't be authoritarian, but as it stands now making voting mandatory would be little more than coercion.