I used to daytrade crypto's back in 2011-2014, and back then I did actually make a living doing things like arbitration trading of price differences between exchanges. Now there is ofcourse a ton of bots doing that and no place for a manual trader like me. These days I just buy and hold the cryptos i believe in for the long term.

I was interviewed in a Norwegian magazin several years ago because I was for a short while living of trading cryptos, have a look here if you want:
https://steemit.com/blog/@xtetrahedron/kryptisk-verdi-a-norwegian-interview-i-was-featured-in-about-crypto