The probably best option would be getting good and being in a clan that gets promoted to clantesting.
That being said, testing is afterall a sort of privilege and has some other limitations which I probably don't know right now I guess. For testing related questions I guess the most well suited staffs would be Ribblestripe, K0degen and Fafskii. The first being someone who I would call our Lord and Savior(no kidding, he's keeping everything here together) and the other two being Supertest-Managers. Remember that the devs are russian-speaking, so being fluent in that language should improve your chances as most testing is still done on russian servers with russian feedback.
Which also means that the very best place to get answers about Supertest would be here: Supertest Q&A / SuperTest Volunteer Website Don't even think of posting english there, learn russian, seriously
Cheers 
Edited by Calisota, 03 December 2019 - 02:55 AM.