The only assured way to get people here is just to wait for splatoon3. However that leads to the same problem later. I'm unsure about an actual long-term solution.
Squidboards
Elbowtross
Dessgeega
The problem is that the bulk of the community has moved to Discord and Twitter, and a lot of useful information is scattered all over the place. There's no real "central" resource for the game anymore on the competitive or casual side. To create that kind of resource once again is going to require more effort from staff here and fans alike than most people would be comfortable with. It's a conundrum.