Since you would like to keep the creative vibe I would like to challenge you to visit boutiques and brave to enter stores you would think are not your style. That's where you find the best purchases by chance.
When you travel, visit the local brand small shops and be inspired. Think about the wardrobe you already have and what would fit in there. Florals, pleats, well made t-shirts, great statement earrings. The world is your oyster.
The cliche but good place to start is Kings Road, but also Soho and Shoreditch.
You come across those best items. You don't shop for them. They appear in front of you.