Hey there! ^^
I appreciate your concern, definitely! I know the current staff has been pretty busy. (I'm still on hiatus, for example. xD) However, when it comes to appointing another admin, that's something that we decide very carefully. It takes a lot of thought and discussion before we even think about approaching anyone to even offer! (And then if the person's not interested, back to square one!)
We have a Team Calls board as well and are currently looking for some wiki mods. We generally use the Team Calls board for mod positions. Anyone can apply for that! :3 Admin positions, however, are pretty different and we don't make Team Calls for that. When we decide we need another one, we'll be sure to approach the people we decide on. ^^
In the meantime, there are ways people can help out! Check the Team Calls board if you want to help! <333 We do have some positions open and help is always appreciated! And if anyone wants to help with something else more specific/something not listed there, throw me or Tally a PM! <3