nice, the game is really hard so seriously, congrats, so the next 2 things you should do is try to beat the game on normal but getting all 12 strawberry's (result is cool, trust me and isnt much harder then beating it normal, other then like 2 strawberry being semihard to get), then the next you should do is the pain in misery that is gemskip. ima just say how to commence it, you have to beat the first level without getting the gem from the chest to commence gemskip, also if you do it correctly the little gem in the top right by the timer will be green instead of the redish pink it is on neutral. gotta warn ya tho, gemskip is really hard so i recommend you pratice normal a few more times before jumping straight into the pain and misery that is gemskip. also, do
congrats <3 if you're planning on attempting gemskip i'd highly recommend checking out the community glossary, it'll be a huge help https://celesteclassic.github.io/glossary/
congrats, but yeah 100% go to that website lol, im reading it over rn and it seems very indepth, however even with this info gemskip is a pain, and even knowing what do to do its extremely hard, i've beaten it once, but im barely able to beat 1300m without spending more time then i would like to admit