Ladders are relatively dead but the tournaments - at least the free ones, particularly 1v1s - still fill. So, it's not completely dead. However, the prizing is a bit weak...faceit points to gold is a 3:1 ratio at absolute best, and winning a tourney only gets you 300-500 faceit points. Having only 20 prize slots on the ladders, along with the insistence of maintaining the 7v7 format when 5v5 or less would be more practical, is basically ensuring that the ladders will never become active. I think if they brought back the 100 prize slot super ladders, in combination with smaller battle sizes, the ladders would become busy enough eventually to warrant 7v7 pro format again, but gotta do first things first.
One way to help the ladders, in the meanwhile...if your clan is wanting to form a team and fight on the ladders, consider instead forming 2 partial teams...then the random solo players on the ladder will get to play, and in a way that isn't just instaloss because they're a bunch of solos up against your clan, and they'll enjoy it more and be more inclined to play the ladders more, which will eventually lead to more people being on the ladders.