I used to be MGE but now that ive come back..

When I stopped playing CSGO i was MGE and this was about a year to a year and a half ago, I came back recently and now Imsilver two. Am I just really bad and lost all my skill or did the ranking system get changed up?

I think nothing has changed related to the ranking/elo system in the last year and a half. There was a big update that affected rank distribution and shifted the average rank towards nova but that was back in December 2015. You probably just got worse!