Don't worry, your old discussion content is not lost. It is still stored away if you need me to retreive it.
Unfortunately the old website built on wordpress was not able to provide the flexibility we needed for a few additional features we wanted to add. So I took the opportunity to ditch that set up in favor of a from-scratch just-for-our-purposes site. This has many added benefits as now we can fix many old issues that we could just not work through before.
There will now be much less division between the survey pages and these public pages. You log in once and you are in both - log out from either, and you are out of both. Signing up will be far easier: no more crazy hoops to jump through with creating an account with links in emails that don't work in mobile browsers - no more creating one account to just then have to enroll again. You sign up once, and you're in. There is now also no confusion about user profiles. You only have one! Log into the new survey pages, and you can provide all the same information as before - but now we also ask for a little (optional) social profile information. This sets your display name for these forums, and gives you a public profile page here with a brief bio if you want one.
I've also done away with the "subforum" idea - that just wasnt working well for us. But you still will create your own discussion threads here. Feel free to other people's threads if you have a reply for them or a directly relevant comment - but otherwise, feel free to start your own thread with a title that describes your question or comment.