I won't have time to debunk the old "yellow is not accessible" myth in my axe-con talk.
But, you are lucky: I already wrote a whole article on how accessibility does NOT limit color choices.
What limits your choices is a lack of knowledge, and / or creativity. I can't do anything about creativity, but, I can help you with accessibility knowledge.

I built six WCAG-tested palettes to show that accessibility doesn’t limit creativity.

stephaniewalter.design/blog/ye

Accessibility: Yellow, Purple and the Myth of “Accessibility Limits Color Palettes”
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