Was this a Siptah server? If so, the system should have auto-migrated you and your followers to a new server. (Your followers will be in the ‘cloud’ for the time being, once you find your character, you’d need to find a spot to build, place down a foundation and then you’ll be able to place your followers from the follower tab.) Unfortunately, you will have lost your base and anything that wasn’t in your inventory or the inventories of your followers. This was all covered in quite some detail in the big announcment about the enhanced edition coming out, but I guess if you weren’t playing, you may not have read it.
There is a list somewhere on the forums of what servers moved to what other servers. Assuming you were on Siptah, that should tell you where your character ended up. (Though there have also been glitches and some people report having lost their characters somewhere in transfer.)
As far as I know, none of the official PC Exiled Lands servers were shut down, only the Siptah servers. Are you on Steam? (Or Epic Store/Microsoft Store?)
I had similar problem after a break i came back and old server was merged to 1009 yet 1009 seems to be dead according to battlemetrics and doesn’t show in server browser…