This is a you problem, not a Blizzard problem. They have already explained, and I even showed you in another thread. Here, I’ll link the post again:
We have disabled new character creation and incoming paid transfers to the US and EU mega-realms, and they will remain locked indefinitely.
This was a difficult choice that we feel is very heavy-handed. By doing this, we will cut off opportunities for new and returning players to join their friends on these large realms, possibly for many months. However, the situation on these realms is completely untenable, and even if we can eliminate queues in the short term, this is going to continue to be a problem when new content releases as long as mega-realms exist. As a result, we’ve made the choice to effectively close US and EU mega-realms to new and additional incoming players indefinitely. We will also be monitoring our other realms and will take similar steps if they begin to inch into mega-realm territory in the future, and we may do so with little to no warning. We’ve been hesitant to this because we really dislike restricting player movements and potentially breaking up social circles, but that ethos is no longer compatible with the reality we find ourselves in.
If you want to play with your friends, encourage them to transfer to a realm that isn’t locked.