Hi, I am new to reddit. Help me decide what realtime collaborative app should I build ?

hi, I love FAFOing and my love for realtime collaborative apps is very deep.

and I am new to reddit, and am bored with X lately.

so, this is my attempt to get to know reddit and build something on weekends.

let me know what realtime collaborative app you need/want to exist and I will build it in weekends.

Thank you!