The problem most recently identified was lack of content in some areas.
One way that someone who wanted to help make these fora a success could help is by participating in ongoing discussions and sharing additional perspective on why SPADFY and other takes on situations being outlined in the original post. Additional valuable content by a seasoned professional will help retain forumites, especially on some of the support threads where people are kind to each other and write encouraging posts during tough times. Joining an ongoing support discussion thread is one way that people make friends here and often become friends who share concerns and very personal details out of public view. The public discussions are only one way that forumites support each other. For those who only interact publicly, try sending a personal message to someone who is giving good advice and thank them or ask your related question. Many well established forumites respond positively to those PMs because they want to help.
A second way a person who wanted these fora to succeed could help would be to start new threads on topics not yet covered. Perhaps those discussions would be related to work to give advice to lurkers who perhaps aren't ready to post yet. Those new posts could be in the form of asking advice as a public service to prompt discussion because experienced professionals know what newbies in several areas should be asking, but may not know to ask. For example, Zharkov used to be the expert on negotiating good job conditions; that's a niche that remains open and in need of a seasoned professional. As we go into the fall term, starting threads on prepping for the classroom and preparing to say no to additional unpaid tasks could be very useful to the newcomers.
A third way a person who wanted these fora to succeed could help is by being the friendly voice of reason on a variety of threads, even when harsh truths must be shared. We could always use another someone with a friendly tone who points out positive, concrete actions to take to ameliorate unforeseen current situations, not just listing the walls that will be faced in the current harsh US higher ed employment landscape.
We have many active forumites making these new fora interesting and productive; I look forward to seeing even more of our newer forumites taking positive actions to engage with the community.