Pro-Palestinian groups have more demands for Democrats, what would you say to them?

This is the only way,

Although that new project will likely die, but only because if they start getting a fraction of votes, the Dems will suddenly allways have supported Palestine and get all those votes back. (wether or not a good thing is up to interpretation)

not being pessimistic, but that is the power of single issue parties (doesn't have to be a single issue, just one that is their flagship issue).