Oh boy, this map looks rushed and it has lacked of focus and hard works. Man, i wish this could be improved, this map needs alot of improvements by the way. Let me help you by giving out my suggestions towards your map.
Suggestion(s) ;
–You really need to focus your work on your islands, it's not that good if you jusy place ores below it and then add some cobblestone walls. Not great, not also appealing to the eye. What i'll suggest is try to search for a picture what a skywars island looks like so that you'll have a better reference or use some world edits so it help you more to lessen your work.
–Second, lack of details. The builds on your island looks bland, it could be improved though.
–The mid, the middle area looks small for me, it also hasn't good details. Again, it could be improved.
Just fixed the following, put some efforts, time and especially hard works to it and your map will be incredibly awesome. Please, take my suggestions to your map, i can't wait to see what can you improved! Have a great day.