Head to the backup tile, the red one. See if anything shows there, check cloud backup tab as well.
Otherwise, in a file manager head to /storage/emulated/0/MacroDroid and check all files to see if it can be restored.
Also, try total commander search feature and search for *.mdr* to check
If you are rooted then there are undelete tools on the play store. For the future, there is an action to export macros, I have this done once a week. Else if you shared any on WhatsApp or any other messaging app then recover them that way or download from the macro store.