What’s THE best method for YouTube Keyword research?

Hi there,
is there a method or a tool how to easily find low competition and high search volume keywords for youtube?
I would be willing to pay $50 for something like that

If I do something like 10+hours (yes 10+hours! sometimes 20+h) of manual Youtube Keyword research I am able to rank my videos for 2-5 keywords pretty easy
and each video makes something like 2,50-15,00 dollars a month because they ranked very well
because I manually searched for high search volume / low…

What's THE best method for YouTube Keyword research?