Ok, so there are several good news to be shared:
1) The relatively new server list is deleting the vast votes every month. Since we have relatively many votes, we pop up on top of the list now. There are only 5 other server with more votes than us (mostly those with permanently 20 or even 100+ users online), so we are on spot No. 6 and therefore very visible on the first page of the website. We are already getting more users from that list, which is great! Thanks to all the voters!
2) I had the idea to install a better referrer tracking. This will allow us to track when people coming from an external website such as a server list becomes a Guest and later if they become a Settler. So we can judge the effectiveness of the server lists better.