How to prove I’m Jewish for Aliyah?

Does anyone have any advice on proving one is Jewish if you weren’t raised in a religious household and don’t belong to a Synagogue?

I’m trying to put together documents for possible Aliyah, but I have no good way to prove I’m Jewish. I can’t find any mention of being Jewish on mine or my mom’s birth certificate. My mom doesn’t remember having a Ketubah at her wedding.

And I’m not a member of a Synagogue so I have no Rabbi to ask about it.

All I have is the yahrzeit schedule for my grandparents’ funeral that’s written in Hebrew, and I can get pictures of their Jewish gravestones in a Hebrew cemetery. But that doesn’t seem adequate.

Any other suggestions on how to prove I’m Jewish?