People are leaving? Well on Ragnarok I see low lvl areas more lively latelly, Revenants Toll just a little less crowded, and the 3 capitals lively, specially LL, for obvious reasons.
I see lots of FC shouting daily too.

And even if the palyer base is decreasing what does it matter ?
It's not like 5000 will stop playing tomorrow, old ones go, new ones come.
You should check the low lvl areas.

Also maybe it's just your server, who knows.