Joe Biden has called himself a Zionist. He will always support the state of Israel. But that doesn't mean he doesn't care about the Palestinians on ethical and moral grounds. It's pretty clear to me the thinking has shifted since October 7th, but the Biden administration is not ready to disavow the current government of Israel. If that's even possible, it would take a lot.
You keep bringing up the Jewish vote, but they are a tiny part of the electorate. And probably mostly living in cities in blue states anyway, so it's not the vote that he needs. But rather the political influence of Jewish-Americans (the campaign just raised $30M in Hollywood the other night).
While it's fair to assess that Biden isn't doing "enough," it's unfair to say he's doing nothing and it's patently absurd to say there's no distance between Biden and Trump on Israel/Palestine policy.
If you look at the major foreign crises of the Biden administration critically, one theme you might see is that they've been slow and reactive time and again. In AF, they waited until the Taliban was about to topple the capital before ordering a military evac. Our support for UA has been unwavering, but it's always been slowly reactive to the real-time needs of the conflict. IIRC Zelensky said that they could've used F16s over a year ago, when it wasn't on the table. In Gaza, we have little to no say in the IDF's revenge campaign. But as the humanitarian disaster has unfolded, we first air-dropped aid and then built a $300M pier that broke in the first storm. Again, sluggish when Bibi continues to treat the U.S. as the junior member of our alliance.
(I'm not privy to internal debates within the administration, but my gut feeling is that NSA Jake Sullivan is terrible at his job.)