Since conversation has all-but entirely moved to Facebook, Discord, etc; the forums are rarely used; and the forum software is an increasing security risk; we've made he decision to retire the forums.
If you want anything preserved, please copy off that data before the end of August 2023. If you want help dumping SQL statements so you can recreate threads on other PHPBB installs, within reason, I'm willing to do those as well. Just be sure to post here before September 1st, 2023. On that date, the forums will be full retired.
If you don't know how to join more active conversations elsewhere, please feel free to ask about that as well, as I'm happy to provide links!