Just going to waffle below but the TLDR is Remove maps, Add fun to mess with T/D weapons (not one-shot auto lock on ones) Stop high focus on unlocks and weapon balancing as it does not attract people back, fix hitboxes and please go back to EU
For starters, if the server is on any of the below maps I instantly don't want to join because they are just so bad and don't attract players to the server either. When map rotation was first introduced I believe I was one to push for it but after seeing how boring most maps are to play (especially 67thway I'm so glad that's gone) I must admit I was wrong and hope we can go back to just b5, and then change for the seasons (Halloween theme e.g.)
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I don't believe there should be a focus on weapons, for example, owners that will remain unnamed came around and just did weapon change after weapon change, only to nerf every gun into oblivion and buff shotguns to the moon (spoiler it didn't fix the server and no one enjoys it) There are plenty of unlocks already and I don't see the desire for there to be more. There are already like 10 different ARs in the unlocks and half don't get used. Then there are the unlocks at Prestige 5+ that no one is going to get other than those who cheated the levels or Darling.
Although there have been some removal of items that have been good like the pigeon, there have been others that were fun to fuck around with that got removed, for example, Golden Deag. harpoon (apparently bugged the server but the server ran fine for like a year with it on so idk? and it's on Sandbox so?) It's like the player base just wants to have fun and not tryhard gun down everyone, I hadn't even loaded into the game earlier and had been gunned down by mouse1 enjoyer Sara. No fun to be had by either party from this happening. I get it's the mode but have some fun with the players build friendships instead of making them all leave from the boredom of you gunning them down with some random broken unlock that they'll never get.
My biggest issues personally lie with the hitboxes and the ping, although there to just fuck around it can be annoying when you shoot someone in the head, just for the hitbox to be broken and not register the shot. A few broken hitboxes are Connor and Big Smoke (not sure if they have been fixed yet or not but they literally didn't have head hitboxes the last time I played) Moving the server over to NA servers has been the final nail in the coffin for the server so far, in my eyes anyway. The only player base the server really had was all EU with the exception of 2?(ish) players With the majority of staff (community team included) being from EU and not NA. When given the option to join a server with good ping over one with few players with bad ping it's pretty clear what most will pick.
I'll add more shit if I can think of it but that's a few points