Only respondents need to worry about quitting, not everyone who used it. Nothing will happen if it grow anything for you. That's not to say it wasn't maintaining some hair for you - this usually happens to people who have been on it so long and didn't realise it was still working as some regrowth was gone. I saw a horrific case on youtube.
Judging from your picture, I think you would easily know if it did something for you or not.