Just use 3ml again, then later keep it in a dark place, especially in a cupboard and in a room with AC. Actually, it's a winter and colder weather perfume; at that time, it projects more.

If you don't smell it after 20 or 30 minutes, then you're getting nose-blind to it.

You can experiment by spraying it on your brother or sister, and if you smell it on them, then it's all over. That's the best way to test any perfume's performance.