No need to apologize for that--you're not a broken-English shitposter in need of ridicule for his language skills. 

Though the specifics escape me at the moment, I know you've been very helpful to the forum with respect to reporting wrongdoers and such, so you've earned the merit you've received and you deserved to rank up.  Therefore, I congratulate you for doing so.  It sure as hell isn't an easy feat these days to reach Sr. Member, so that's quite an accomplishment and I've no doubt you'll hit Hero within a reasonable amount of time if you keep up the good work.

As far as getting Legendary....it's anyone's guess whether you'll earn enough merits or activity first in order to get there.  Hopefully you won't have to wait until you have an activity of 1025 or whatever number it was that I (and many others) had to wait to get.  But that's the future; props to you for your current rank-up.