A tool that surfaces related terms is giving you a starting point for research, not a definitive, complete map of every relevant concept for your topic.
Treat the List as Raw Material
The related terms a tool surfaces are most useful as a starting point for deciding what your content should genuinely cover, not a checklist to insert verbatim.
Filter for Genuine Relevance to Your Specific Content
Not every related term returned will fit naturally into every piece of content on that broader topic; use judgment about what's actually relevant.
Combine Tool Output With Your Own Topic Knowledge
The best results come from pairing a tool's suggestions with your own understanding of what a thorough treatment of the topic should include.
Next step: Use the LSI Tool to generate a related-term list you can filter down to what's genuinely relevant.