Perhaps you should be recruiting. Toss the net out at Reddit (I know you aren't a fan) or some equivalent. Send out personal invites to people who have caught your attention. I'm sure there are plenty of people who are still heavily involved with the game who just don't know how to contribute.
STEP has become the definitive guide for the best mods to start with - mods that don't work at cross-purpose - and I suspect there are many who would hate to see it waste away. I know I personally will be hesitant to start SE without a step guide.
We do this about once every six months with the staff already on board. STEP staff members have at "hierarchy" or "role" they start at and rise through. The staff groups, roles, and hierarchies are linked on the Citizenship Guide. Staff typical start at #5 on that list and move up to #1. In addition to staff we also have members and authors who are not considered staff, but are moderators for their respective forums (sheson for DynDOLD Support forum, Mator for Mator's Untilities support forum, Neovalen of the SR forums, etc). Staff are typically recruited from the members of the STEP forums who show an interest, often by stepping up and helping with the project in some way of their own accord. This is how EssArrBee, DoubleYou, several of the Super Mods/Moderators, and myself were recruited. S4N and Z are basically the only two remaining "founders" of the project as it is today. TheCompiler still pops in from time to time to look things over.