1. I find someone to talk it to out loud. Even if that person isn't knowledgeable in the field.
2. Write it down as if you were doing #1 describing it to someone as if they were 5. You would be surprised how soon you find holes and/or new insights.
3. Read sites that encompasses vast knowledge of many subjects and not vertical to singular. A site I like to visit is: https://www.sciencedaily.com/ Vast latest articles and finding covering every subject.
4. Talk to people and also think in their shoes if they heard such an idea by putting yourself in their world view.
5. Find a movie that is in that realm of an idea and let your mind wonder.
6. Listen to something benign like trance/house music.
But most of all I like #1 where I talk to someone but moreover, talk to someone who has a breadth of knowledge and not necessarily vertical to any one in particular. Ideally a nerd be good.