Telling your customers to simply change servers is a null argument.. First of this this is early access, you expect everyone to sacrifice their progress because you failed us at launch? You failed us with the "waves", you failed us bringing new servers online, and now you're failing us by not fixing this mess. This is a self inflicted wound, you BW utterly worsened this launch with every decision you made. Mismanaged.
Moving forward there are measures that can be taken.. Limit new characters to those of us who have existing characters on a server.. Raise server capacity, allocate more resources per virtual box.. Allow guild migration.. At worse and likely a guild killer, allow character migration. Please note those last two as being far fetched and requiring dev resources.
Whatever measure you choose START talking to the community about this issue openly and STOP talking to us in press release marketing bs talk. We need to know you understand this issue, have a decisive course of action, and care about our progression.