Can you always find someone on the internet (newbie) ?

Hello, I'm an OSINT newbie.

I decided to get into it with a close friend of mine because I saw a video of a man helping the police find missing or wanted people and I thought it was really cool.

My friend and I have known each other for about 5 years but we only play games together most of the time so we don't really have much information about each other (discord, nicknames on some games, Twitter and Snapchat). Our challenge is to find as much information as possible about one another before the end of this week but I can't find anything and it's frustrating. I tried to find information on his social medias or with the Wayback Machine but to no avail.

Do you have any advice? Thank you in advance if you answer ! (English isn’t my first language, sorry if there’s any mistake)