“Literally everyone” is about 30,000 students out of 3.7M high school graduates. Less than 1%. You have distinguished yourself from the rest.
To (beneficially) distinguish yourself on Chemistry, get an 800. 780 and 800 are distinguishably different.
If you want to distinguish yourself in Math to a more elite level, send AMC, AIME, and/or USAMO scores.
You can try to be like the 99% of HS graduates who don’t take subject tests by not sending your scores in. Then you’ll see if they matter.