Youtube Keyword Niche help!

Hey guys, I'm using PPD and i've only found 1 profitable niche all by luck and now im stuck at a dead end.
I average like $10-$15 per day on sharecash but I have 4 videos uploaded to youtube with 2,000 views + but all my money is coming from my 1 video only.
Is there a tool or website that lets me see the most common youtube searches for PPD type of things for example a fifa coin generator? etc....
thanks a lot!

You can use Google Keyword planner to trackthe keywords,subkeywords in SE. But dont know whether there's any for exact YT