I played RotMG about 3-5 years ago, can't really remember but I played it early on, and was wondering what I have missed and if it's worth coming back to? How easy is it to make FG on it and yeah just curious how is the gameplay?

You wont make fg, the market is dead. Coming back is fun, but you will need to be very careful, start slow, get some gear together and then start chugging pots until you can do more and better dungeons until you get maxed and you get to the fun part. Gl.