The idea generator of yourtextguru is very useful to quickly find related topics to your main query.
The video explaining the idea generator
Video summary:
The idea generator is available in the dashboard of Yourtext Guru by clicking on the word "ideas".
By entering your query in the search engine, and selecting the intention (how, what etc...) you will get many proposals for related contents to your main query. Sometimes it can happen that the tool does not have any related content to propose because Google does not identify any related content for this intention and this query.
Once you have retrieved the ideas generated by your query, by clicking on the question, you can order an additional guide to expand the scope of intents you can capture. With the API you can even automate this from start to finish.