What can I do better with the cherry blossom petals I found?

You can take a bath, make tea and make Chinese medicine.

Rose petals are sweet and moist in traditional Chinese medicine, and have the effects of expelling toxin, caring skin, promoting qi and blood circulation, inducing resuscitation and removing blood stasis, soothing liver and invigorating spleen, promoting bile secretion, helping digestion and regulating mechanism. Rose petal tea is mild and suitable for both men and women. It can relieve mood, balance endocrine, replenish blood and qi, beautify and protect skin, regulate the liver and stomach, relieve fatigue and improve physical fitness. Rose petals are fragrant and elegant in taste, which can ease mood and relieve depression. The most important thing is its beauty care effect, which can often remove dark spots on the skin and make the skin tender and natural.