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Depends on what your language’s script is then with assigned Unicode characters, how wide-spread it is, when fonts will support the glyphs, and what you mean by “changes to be available on my local OS”. What OS? What does available mean here? Do you expect the OS UI to be in your language? Doubtful. Some desktop environment maybe somewhen. Programs using ICU are more likely to support specific script related features (e.g. word/line breaking, transliteration) when ICU will support Unicode 16 in its next version. Locale specifics may have to wait for or could be contributed to CLDR that is also used by ICU. Availability of any UI in the language mostly depends on whether translators contribute to the relevant projects.
ICU & CLDR is an excellent place to start for anyone who wants to help out with support for any not yet well supported script and/or language, for those libraries and that data are what a lot of other things are built upon (like Android, iOS, Windows and macOS, to take four of the largest and most well known examples).
To get in touch and offer to volunteer, sending a mail to the icu-support public mailing list can be a good starting point: https://icu.unicode.org/contacts
