Yes, I have Five Years Experience in digital marketing fields. You want to know about free keyword research tool for accurate avg. monthly searches. For this, I prefer only Google Adwords - Keywords Planner or Google Trends
I asked you about free keyword research tool for "accurate avg. monthly searches".Google keyword planner does not show accurate avg. monthly searches like it used to show it shows between 100-1000, 1k-10k.
I agree that Keyword Researcher by Google is the best keyword research tools among the free ones, yet it will make a huge difference if you decide to rely on the paid and therefore more professional solution like Ahrefs for instance.