Thank you so much!
As for the multiplayer server, I will have to get admin somehow. If there is a way to do it without having to get admin enlighten me :/

So that means I would have to wait another 3 months to change my username back?

edit: trying /swap-players [old-username]:

I just changed my username on factorio.com/profile, but now when I join a multiplayer server I join as a new player. Also, when I join a single player game (that I have saved from a multiplayer server hosted by my friend) I spawn as my friend's player. How can I fix this and get my stuff back?

how will space exploration work with space age? are they gonna be compatible