Firstly you’ve used a lot of //sphere and it’s quite evident. It doesn’t look good and think from a PvP perspective - it’d be a little wonky.
Second of all the islands themselves have a poor colour palette. It doesn’t have the blocks necessary to make the colours blend in nicely. It looks really strange
without contrasting colours.
The shape of the islands is also wonky. You’ve made what’s essentially an inverted mountain. That doesn’t really suit the theme of this guardian temple map.
The organics - the seaweed look terrible. My suggestion is to make them large and give them a lot of shape. You can do more if you have a few large ones rather than countless small ones. Fewer the better.
Lastly, mid itself looks unimpressive. I just dont but the architecture. Even a vanilla generated structure looks better than it. I suggest you go watch a few of Grians’s videos on building for this part.
Hopefully my feedback is useful to you