Even the most novel of ideas can be traced back to some earlier, conceptual forerunner.
Where they come from may be less important than your openness toward recognising and accepting them, and that usually means putting aside your biases, assumptions and preferences.
Read something you'd normally put down. Listen to a playlist from a stranger. Study images that make you uncomfortable. Walk a different route to work.
Good piece below.
Many people have figuratively stood in thunderstorms, waiting for the creative lightning to strike. But creative ideas evolve from existing memories and impressions. Instead of new ideas being lit aflame by lightning bolts, they arise from the interweaving billions of microscopic sparks in the vast darkness of the brain.