Protest, take direct action, whatever you want. Get organized with some other groups. There are plenty. (Edit: nothing you do is going to stop this genocide though. It's far too late, though we can decrease the harm that is done.)
Telling people not to take an action isn't helpful. You always see people (who say they're leftist, although some are certainly right wing trolls) saying not to vote, and they never advocate for doing other things. How about protest, but also vote? Why would anyone advocate for not doing something? The only reason I can think of us to get their guy elected instead.
If your contribution is saying to do less, fuck off. If you're saying to do more then welcome. You may actually help.