Coming to Israel, where can I study hebrew?

Hi, I am a 65 year old American male. I went to medical school in Tel Aviv but was taught in English. I lived in Israel for 4 years. I have been studying Hebrew on duolingo for 1200 days in a row. Really to become fluent I need to go to Israel and live there a few months in a way to immerse myself in Hebrew without being around English speakers and also having formal instruction. What are ways I could best do this as a 65 year old? Thank you. Mark