You design the sequence of interactions with the product.
Operate everything using the keyboard
Draft a solution that can also be operated using the keyboard. Do not rely just on a mouse or on gestures. Also consider the order in which the focus should move to enable logical and convenient use. Testing: Take away the mouse or connect an external keyboard to your phone.
Reference 1: https://www.w3.org/TR/WCAG21/#keyboard-accessible
Reference 2: https://www.w3.org/TR/WCAG21/#focus-order
Make entries comprehensible
Make as clear as possible which entries are expected from users. Put in clear labels and instructions that are always visible. Explain the problem when entries are wrong and give a warning before important actions. Testing: Ask someone outside of the product team to explain your screen.
Reference 1: https://www.w3.org/TR/WCAG21/#headings-and-labels
Reference 2: https://www.w3.org/TR/WCAG21/#error-identification
Don’t just use colour to convey something
Ensure that colours are not the only feature that convey certain information. For example, don’t just make a link red; underline it as well.
Try to find an alternative if you come up against something that cannot be made accessible. For example, provide important information from a map in text format too.