I recommend taking information from people who you can’t verify as experts with a heavy grain of salt. There are many widespread misconceptions about many things (for example, Tor browser can’t make you look identical to all other Tor users), and lot of people don’t really know what they’re talking about.
Two more ideas to throw on the board are to look for some kind of reputable whistleblower consulting, if such a thing exists, and to look at whether your government has an effective whistleblower/witness protection program, but I’d follow @anon67953901 's advice and read up on everything you can before making any sort of plan.