How can I expand my new Garry's Mod Community?

So basically I've started a DarkRP and Deathrun server on garry's mod, and I am almost finished coding/customizing each one. I have a few players, some are staff already, but my main question is the advertising part... I have a public discord, I've been trying a lot of different ways to advertise and my servers are dead.

I think there are many ways, well, firstly, you can invite your friends, and they will invite theirs, and so on. You can attract people with some kind of bonuses. Or the easiest way for me is to order an advertisement.

THE ONLY WAY IS TO HAVE A CONSITENT PLAYERBASE ONLINE SO FRIENDS

Make a nice video of some gameplay or what have you and hope it gets some clicks.