Best Youtube keywords tool?

Ahrefs does not works for youtube right?

So alternative keyword finder?
Not keyworldtool. io
Something like semrush or ahrefs

That's not really how YouTube works. You can use the free versions of Tubebuddy and VidIQ to perform tag research, search volume and search competitiveness research (since I'm assuming it sounds like you're trying to find a niche).

You should focus on producing content with a high click per impression ratio that leads to high watch time. You will need a higher than average relative audience retention rate to succeed in your niche. Reliable SMM panels can be used to boost your tags and give social credibility. Make sure to always have calls of action to build your following.

Good luck!