I get it.
Some things that are easy quick fix joy for me:
Brilliant music. I put on really fun, uplifting music first thing in the morning and after work- songs from any carefree or happy time in your life or anything that just makes you feel good.
Comedy shows - either an episode of a favourite comedy or a filmed stand up routine by a favourite comedian or clips on You Tube.
Healthy food joys - fresh raspberries or chunks of watermelon chilled from the fridge are delicious; strawberries with plain greek yoghurt, radishes with a bit of seasalt. Chunks of chilled cucumber on a hot day are so refreshing. Sparkling water infused with mint and citrus fruit, with loads of ice.
A page-turning novel.
How about a fitness magazine - you get all sparked up thinking about how fit you'll be.
Very quick workouts on youtube - 5 mins yoga or HIIT or bodyweight bootcamps. there are loads of them.
Pampering routines - deep bath with scented oils or bubbles and candles; home facial, pedicure or manicure.
Going to a department store and trying lots of different scents.
Watching and listening to the birds first thing in the morning, or sitting in the garden or a park as sun goes down. Focusing on a beautiful flower in bloom, or the dappled sunlight through the trees - any natural beauty.
Cuddling the cat if you have one, or just watching cute dogs and toddlers around and about always makes me feel happy.
Going for a walk in nature. Doesn't have to be strenuous - a slow stroll, appreciating sky, trees, wildflowers. It's still exercise. If you are not near nature or a good park, any place where you can just stroll and look which isn't based on food - a flea market or boot sale, antiques centre, fabric store, garden centre etc.