Give Answer the public a try -
https://answerthepublic.com/
I found about it a month and my usage grows all the time.
For example I have entered "Coin trade" (You can't imagine how much profit one can gain with Forex trade or Crypto trade+ bot automation).
And it returned 183 Forex related questions, for example:
will coinbase trade ripple
can you trade coin
where to trade coin
which coin to trade today
which coin to day trade
which coin to trade
what coin to trade today
how trade coin club works
what is trade coin club
bitcoin trade
what coin to day trade
what is money trade coin
what is safe trade coin
where forex is traded
where forex money come from
forex where to start
forex where to put stop loss
forex where to invest
forex where to set stop loss
forex where to place stops
where is forex located
countries where forex trading is legal
countries where forex trading is illegal
where does forex data come from
where is forex market
countries where forex trading is tax free
These, with combination with more keywords can be a perfect longtail focus.