Been back a few weeks now and decided to start on Agnarr server. I am missing last 3 expansions, do I need to get latest expansions or would it be a waste of money?
Agnarr will lock at the Planes of Power expansion, so there's no reason for you to pick up the newest expansion if you're only going to be playing there. Like TLPman said, a new Progression Server (Coirnav) will be launching on March 16th, which would allow you to start from the beginning with the rest of the players on the server. As this is a Progression Server as well, there wouldn't be much of a need for you to pick up the expansions any time soon either (though you potentially could some day).