The way to find people in 2019 is “Streamers discords”. Popular streamers have discords with about 2000 or 3000 active players. Is very easy in these discords to find active people searching for activities, and usually theres also a channel to find a guild. If your current guild is dead, is advisable to change to an active one.
In spanish theres two popular streamers, Daykiri and Wildgamer. I have both servers, I recently joined a guild there. Then they invited me to a whatsup group where they are tryiing to create raid groups basically 24/7.
For english, I imagine Gothalion, Bomer or Datto would have something similar.