Plenty of suggestions for Staff/Server and many more.

[IceQueen 1]

Okay. i'm not gonna rush straight into this, so i'll first say. What a great job the staff and builders have done already. As always there is room for improvement. In which case, i will possibly try to give as many as i think is possible. So first things first.

HUB SERVER IMPROVEMENT:

The hub server's already looking spectacular. The improvement i can see in the hub is essentially the inventory Server choice item plugin, i forgot the name of it. but you should know what i mean. click on the item and choose the server you wish to play on. As if the shortcut to the servers are not short enough already!
CREATIVE SERVER IMPROVEMENT:

So then comes onto the Creative server which i see you can improve dramatically. I can see plenty of potential in the creative server. Anyway, the creative server as we all know will already have a rank system. on which case i recommend using [Default] > [builder] > [builder+] and so on. But the ranks aren't essentially as important as the main object of this improvement i see. I think the rank default should earn Builder via using 3 plots. now the plots need to be perfect and unique. the reward of builder could be a prefix/suffix and a command to the "Builder world" or "Artifax" as i would like to call it, Now the Artifax, would be known as a freebuild which is not a plotworld. but a world where you can build anywhere you like with no limits. Like i said, there could be a builder+ or any other type of prefix. which allows you to own Worldedit in the freebuild. There is also an idea i thought where Donors could use worldedit, but only in plotworld, unless the donor is a Builder/Builder+. I may think of more ideas for the Creative Server.

DONATIONS IMPROVEMENT IDEA:

For the Donations i can see this going in 2-3 ways. I will mention all three but i recommend the first of the three. 
1. I think "Memberships" would work well with a server of this type. So, imagine the donation site, there could be 2 types of donations.
Membership-Donors will be rewarded more items but the membership will be as such from a range of 1 month to 3 months, on going to 1 year memberships. 
2. Donations perks for all: So... say someone would like to use a certain command e.g. /back or /fly in survival. or maybe /we type commands. (Also this works alongside EULA if you wish to go down this route) So. the Perks would be on a rolling time limit of 1-6 days or up to 1 week. Depending on which perk you choose.
3. ColourNameChange/Nickname: I suppose this works along side the donation perks for all. Like it seems, it does what it says on the tin, the person donates for a colour change or a nickname. 

PLUGIN IDEAS:

So i have a few plugins that the server would benefit from. I believe this could improve the player count/Donor count. 
1. Link plugin.
So this is a plugin i have seen on other servers. It's tricky to use, but it's much better than links, so. You want to link a youtube channel or some type of website? by creating this you can simply type something like... "link:NAMEOFLINK:URL" and the URL being the link. the NAMEOFLINK would pop up on the screen in chat with underlined. This would be easier to tell if it's a link or not (Sorry it's really hard to explain this plugin XD)

2. Referral plugin 
So basically this also does what it says on the tin. The referral system could uphand players with rewards. So the reward system could be..
1 friend referred = 100 of currency. 
20 players referred = VIP1 for a week. 
50 players referred = VIP2 for 2 weeks
100players referred = World Edit for 7-14 days. 
etc. 

3. Car plugin 
This plugin is more or less a good idea in my opinion, i haven't tested this myself, but the plugin seems to let players plonk themselves in a minecart/boat and drive on a particular block. I believe this would make the server seem unique and fun to play on. 

So that's all the ideas i have thought of so far... I will rest assure that i can think of more for you guys. I hope some of these have helped you.

 

[portalBlock Dev 35]

I like the car one, sounds fun

[HOOOSK Owner 608]

ooh!  the car one does seem fun