For me the DarkRP servers were getting quite bad way back in 2016. I've played on Zarp since 2014 and when the owners started introducing many of the OP stuff (Weapons, suits etc.) around late 2015 then it was already becoming increasingly hard for a new or even just a poor player to actually do anything on the server. Basing as a new player was/is practically impossible as once someone discovers your base, they'll just use their OP weapons to blow your whole base away with 1 rocket and come running in with a suit that gives them godly amounts of health and armor.
I remember very well how there were new players just following admins around spamming voice chat to complain about this stuff, but they were muted and thus left the server. These very same problems that kept the new players away have also now started to push the remaining player base away.
I still sometimes try to play on Zarp, remembering how fun it was wayyyyy back when people actually had to come lockpick your doors and try to actually sneak into your base. There was problems way back then too, obviously, but they weren't even remotely as bad todays problems.
My personal opinion on all of this is that if there is really any chance of bringing Zarp back to its former glory, then the servers really need to be reset, and i've seen this idea be thrown around occasionally for years on the forums already but the poster always got clowned.
Reset the server, but launch polls on the forums to get see what the community wants for the *new* server. Start with a clean slate without all the OP things and the fucked up economy, give new players a chance to actually enjoy their stay on Zarp and also just listen to the community, nothing works better than pro-consumer decisions imo.
All that being said, Zarp has lived a very long life already and Gmod itself has a dwindling player base, so it's questionable how much can even be saved anymore at this point.