In addition to the very insightful reply by Ferk: Sadly most TTS development seems to be happening as online service these days. Google Neural TTS and Microsoft Azure TTS sound really great but require an online connection, an account, and possibly even paying (there’s a threshold until it’s free, then it costs almost nothing but almost nothing isn’t free).
Btw, I don’t know about the blind people you know but the ones I know use so insanle fast TTS output, the “sounds nice” aspect isn’t really there in the first place. At least not to me.