Keywords: Isreali citzenship and emigrated in 1933: Assuming you grandparents fled nazi prosecution or other discrimination: look up Stag 15. You may be eligible trough that route.

1933 is a bit on the edge, the law says 30 January 1933. That can be tricky to proof.

Not enough information.

Did any one in yours direct line naturalize, meaning become citizen of an other country? (Other then at birth) Becoming a citizen of an other country is automatic loose of german citizenship. Dates matter.

Fathers Line: everyone born in wedlock? Yes: easy - get marriage certificate. If not: the father does need to be the father under german law. This means consent of the mother and father. Some birth certificates count, some do not.

Next: get birth and marriage certificates of all relevant ancestors. If not born in wedlock: your last time under german law might not match your current last name.

What year where you born?