For sure there is, but this won't work in a few days.
You need a few friends and much time.
Play with your friends on your server even if you are allone. Other will join the server. If the server is attractive for them they will come back. After some time they will start doing the same once there are some more players. They will join it even if it is empty because others will join sooner or later.
My server where full a few minutes after one of my clan joined one of our servers.
As saied: it is not hard but needs time.