Store those you seldom wear in the refrigerator and keep your everyday scented products out of sunlight and away from heat sources. Don't wear a fragrance in the sun. It may increase photosensitivity. Scents don't mix well with perspiration, either, such as at the gym or at aerobics. Save your fragrance until after your shower.
Fragrances evaporate more quickly from dry skin or in dry air.
Apply moisturizer or body lotion before you apply scent for more staying power. Fragrances smell stronger during warm seasons than during cool seasons. Adjust applications accordingly. You really can't smell you as well as someone else can smell you. Rather than compete with my brother, get a second opinion from an honest friend.