I have been living in Israel for close to thirty years.
My message is simple and almost always true.
An Israeli who finds himself in the States learns English because otherwise he will fail. Your grandparents came from Poland and Lita , learned the language of the country and succeeded.
There it is. If you want to live here, put in the time and effort to learn Hebrew. Go to Ulpan. Forget about your American accent (I have a heavy one), it is an asset, not a liability. Read the Hebrew newspaper ONLY. Listen to the Hebrew news ONLY. Without it, you stand to fail. You know aleph bais? Read a siddur? A chumash? You are more than halfway there. If you don’t, you will forever feel alien, and aliens fail. Failed? Blame yourself.