I wrote a blogpost about simple checks every developer can do to ensure, that their products are more accessible.
https://eevis.codes/blog/2021-05-28/dont-develop-just-for-yourself-a-developers-checklist-to-accessibility/
https://eevis.codes/blog/2021-05-28/dont-develop-just-for-yourself-a-developers-checklist-to-accessibility/