Do you have a source for your claim? The Biden administration did present a ceasefire plan <https://en.wikipedia.org/wiki/2025_Gaza_war_ceasefire>. If not that, then I don't know enough about the situation to find what you're referring to.
The Biden administration also kept publically decrying the situation in Gaza while also promising full support and increasing weapon shipments to Israel. Saying one thing and doing the exact opposite over and over again.