I struggled as well to find my father on the Ellis Island passenger list as well.
Just recently, i found his application for naturalization, which listed the ship and its date of arrival.
The game changer was that it stated he arrived under a different last name.
With this information a returned to the passenger list records and behold there he was with his mother, half sister and brother all under this other name.
The new mystery was where did this name come from, it did not fit any name that I am aware
Signature: Please “sign” your posts and replies by including your full name at the end of your email. https://groups.jewishgen.org/g/main/guidelines