Walk On Your Own Feet To Reach

Accessibility Testing is a non-functional testing type. This means anyone can use a particular web application, mobile application, website, or any other software package. Any human means not only perfect men or women but also differently able people as well. Things can be used for testing, 

Mobile application types, Web mobile. Native applications. Hybrid applications.  Mobile testing types, Security testing. Accessibility testing.

This question is on mind of all QA and QE engineers , As per my experience following will made better QA, Design cases together with team.  Test first. Be more technical.  Be on definition of done. Touch it , feel it and sense it. Ability to code review. Responsible.  Monitoring and assisting operation works.  Be knowledgeable on the domain.