The better your capture system is at noting down any idea your subconscious mind is giving you, the more ideas and creative you'll feel. It's the ultimate positive feedback loop. Make sure you have a solid capture system. I personally use Tana for that, with tags for each type of content. Anytime I have an idea, I write it down and add the corresponding tag. Also added widgets on my phone to quickly capture things when I'm outside. If you don't have a capture system, implementing it will be your n°1 best thing for your creativity, I promise you. Just start. Apple notes will suffice.