You gotta to prioritize your higher range. You’re starting masc puberty now, your voice isn’t gonna stay high, and while it’s dropping, you’ll lose the ability to sing a lot of great numbers. That isn’t dependant on the person, it’s just an inevitability.
My buddy really worked on his higher range while he was starting on T, and somehow never lost his falsetto the whole time, and could even project it out on stage. Since I only ever practiced my lower range, I completely lost the ability to sing even the non-crazy tenor songs for like, 4 years. I just got it back over a year ago, and while I lost all the bass notes I could somewhat hit as a teenager, it’s much nicer to be able to sing the long list of songs I wish I could before. Everyone’s voice evens out eventually, but it took my voice a whopping 7 years to sing the songs I wanted to. Which was completely on me: the only person I’d ever chastise for making that mistake.
This isn’t a dire issue, and if you have a lower voice and plan on being a bass singer, this probably isn’t applicable. But I know how fucking annoying it is to lose your tenor range otherwise. If you’re in theatre, other than the old men who notoriously have the worst songs, basically every song is meant for a tenor. Did Newsies in 2019 when I had about an octave of a range to work with. Had a fantastic time, couldn’t hit a single note though.