How do I clear more space on Mac and delete the incomplete download from App Store

first of all, take a look at your file system and how much space they occupy. type this command in a terminal:

Remove the indesirable files

du -sh *

then remove the files that you don’t need

rm -rf <directory-name>
or
rm file-name

Remove The caches.

type this command in a terminal:

cd ~/Library/Caches