Whats the best way to promote a server?

Basicly, whats the best way to promote a server. Me and a friend started one up about half a year ago and weve had some up and down times when people would join, but people dont seem to join much and our forum is dead (i cant even remember the url). So does any one know the best way to get people to join?

Our server name is lDDl Build i dont know the ip as i dont host it and we only do sandbox. we have a few mods PHX 3 wire… ect not stargate but we may add it on.

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Contact me on: Dissembowled steam name

Join a bigger clan.

start a steam group and then invite everyone who has a steam account