That might not be the right question
“Where do you get your ideas?”
The thing is, everyone has ideas. All the time, every day. Having ideas is part of the human condition.
The right questions might be:
Are you exposing yourself to new inputs and new situations, and challenging yourself to find more interesting ideas?
Are you pushing the ideas you have further, making them more complete, turning them from hunches to notions to ideas to theories?
Are you publishing your theories, sharing your reasoning and having your ideas collide with the real world in service of making things better?