Play some games?

Super Mario Bros 3?

The thing to keep in mind if you go the peroxide/retrobrite route is that it makes the plastic physically more brittle and weaker in order to obtain the original coloring and the shell will yellow again at an accelerated rate unless you also coat it in something UV protective which will likely end up looking shiny or slightly off. I say just keep it as is and enjoy playing it while it still works.

You can get rid of the yellowing by soaking the shell of the NES is dilute hydrogen peroxide and shining UV lights on the shell. There’s a bunch of tutorials all around.

https://amaiorano.io/2022/09/13/nes-restoration.html#retrobriting