Begin with seed topics close to what your audience already cares about: a task, problem, product category, skill or question. Search each seed and study the exact wording and content angles that dominate the first results. Titles often reveal whether viewers expect a beginner tutorial, an advanced workflow, a comparison, a case study or a fast answer.
When approved related-search data is available, use it to branch into adjacent queries. Click one related phrase and run it as a normal search rather than automatically spending quota across every suggestion. When no approved suggestion feed is available, use the result set itself: note repeated modifiers, questions and formats, then test the most plausible phrase directly.
Creators with an authorized channel have another source that is stronger than a generic idea list: their own YouTube Analytics search terms. Those queries show how viewers actually found that creator's own videos. Connected mode belongs to the owner of the channel and must stay private.