what i would like to do and why i don't:

bluetooth federated chat app

why not? Jack Dorsey was quicker with his bitchat, sadly

sci-fi text rpg about a girl on desert living in a city after apocalypse

why not? i'm bad at finishing stories and personally i have problems with making that story full and making it playable (i doubt resource management with a shop is sufficient), additionally i have problems making additional items in story like books and i'm also bad at talking to people, what just makes a perfect mix of a person not being able to do it, sadly it's me…

low-level web browser with custom markup and programming language

why not? too big project for one person even if that could end up being like lynx…

operating system

why not? reason same as above