However, my sites still look ok. I've adopted the idea of "use different shades gray to make UIs" and, as a result, my sites look... professional but uninviting.

Consider sites like:

- https://curius.app/

- https://www.notion.so/

- https://www.focusmate.com/

These sites look warm and inviting. Being proficient with Tailwind CSS just helps me have good padding, margins, and a reasonable default color scheme. It doesn't help me make my site look... human.

I feel like I need a "design palette" instead of a mere "color/margin palette". What's the recommendation for this?