Exotic Gardens alone doesn't substitute the amount of content that players are missing from the rest of the addons. I think it would be a fun idea to add some of the official or 3rd party addons for SlimeFun4.
All the plugins can be found here: https://github.com/Slimefun/Slimefun4/wiki/Addons
SlimeFun4 can be found here: https://github.com/Slimefun/Slimefun4