Hi!
I took a look at your map! Some of my thoughts:
The layout of the spawns and control points are weird. The second spawn of blue feels like it's farther away than the first one is. There is no buffer between the control points. The map is too big, there are too many open spaces and sightlines and no alternate paths and flank routes.
Long, straight corridors are generally not a good idea, putting water in them is even worse because it slows players down and it makes it even longer to traverse. Putting the third spawn of the teams in these trenches is also questionable, players have to wade through the water and climb out somewhere below mid, very awkward.
Making angled water surfaces leads to visual glitches.
You can stop the mill by standing at the end. You might want to move the ledge farther away so players can drop down between it and the mill. (Or just make it stationary, idk what purpose the rotation serves.)
Hope this was helpful in improving your map!