what to do after diagnosis?

hi i am 19 and am currently in the middle of my adhd and autism diagnosis and have my final appointment in 4 weeks. i know i should probably wait until i have the official diagnosis and perhaps start medication but i wanna know how i move on exactly after my diagnosis. i am just really overwhelmed as adhd and especially autism arent like a specific set of symptoms that you can combat but more like something that affects every aspect of life and you just have to deal with it somehow. so i dont know what to do. how do i unmask? what changes do i make in my life? do i tell people and be open about it or keep it private? how do can i make my environment understand me? especially because i live at home how can i explain to my parents what needs i have and like that i actually have a disability despite being highfunctioning? how do i deal with grief of the lost time, and how do i manage all the side symptoms besides the obvious one (rejection sensivity dysphoria for example). its just a lot and i dont know where to start and i feel like the more research i do on neurodivergence the worse i feel because i dont have a clear plan on how to actually improve myself and my life with audhd. you can share your experience if you like