The people that are currently protesting the Gaza genocide will continue to protest no matter who is in office.

Absolutely, but Trump will spend more time demonizing them as antisemitic terrorist supporters. He's always been rabidly zionist and has always loved using leftist grassroots movements as a bogeyman, he's not gonna pass that opportunity up. Idk if that would translate into more actual repression against them, but islamophobia dressed up as fighting terrorism traditionally has a lot of traction in the US, and i do not see the Dems pushing back against that even if they would control both houses after the midterms, genocide support is a bipartisan issue after all and they will falter when Trump links the Dems to the protests like he did with BLM. It's also possible that Trump lays the ideological groundwork for more effective anti-left policies under a Dem presidency from 2028-2032. He's good at normalizing atrocities, and the Dems have shown to be eager to then implement that (see also: deportations and the Dems bragging about how they actually built the wall that Trump promised). There can absolutely be a ratchet effect in this regard.

I could also see Trump being more supportive of the genocide itself. More bombs, more open endorsement, more troops on the ground. Biden has already sent missile defense crews there, i think this still has potential for escalation, as hard as that is to imagine for many people here.

Mind you, i'm not doing a lesser evilism here, it's the morally correct choice not to pick between hand-wringing and enthusiastic genocide, but to treat this as a line that can't be crossed either way. But it's absolutely possible that things will get worse in this regard under Trump.