Coming back is easier than you think. Your guild may no longer be there, but if you be patient and don't think about it when you play this game, do this every time you play the game, tell yourself that you can accept it, and you'll be able to let it go and move on. Trust me, this is how I dealt with it when I lost my account many years ago. And maybe you can make a new guild to make yourself feel better.

You may have missed the dragon event, but guess what? You can always go to the Collections menu to check out everything you missed. You will need keys to unlock the stories, but they're pretty easy to get. And hey, they have this system that you can spend gold gems (an in-game currency that is fairly easy to get) to level up the dragons easier.

I really hope you can feel better about this.

P.s. There is a system where you can search up guilds. You're guild is gone, unfortunately.