What is the best way to find highly searchable keywords?

I am trying to create a listing for a new product. In doing this I am trying to find the best keywords. What do you use to find highly searchable keywords?

Definitely Helium 10 or Viral Launch. There is a great free SOP on this in the Flowster Marketplace: https://in.flowster.app/marketplace

you can use gadget product or see live example here expertido.org