When you need to delve into a topic or subject matter, you can use a variety of synonyms for the phrase "go deep into". Some alternatives to consider are "dig into", "explore in depth", "analyze thoroughly", "examine closely", "probe deeply", "investigate intensively", "scrutinize extensively", "delve deep", "penetrate deeply", "plunge deeper into", "venture further into", "navigate deeply", "traverse deeply", and "immerse oneself in". By using these various synonyms, you can add more depth and specificity to your language, improving the clarity and precision of your writing or speech.