Compete in Tournaments / game battles multiplayer and warzone.
Maturity - What I've noticed scouting for players is that many of the ones that succeed have an immense maturity. Unfortunately at a high level of gaming we have to have fun but also be able to continue to perform under pressure.
Passion - Some people like to play video games, others love to play video games, professional esport atheles live to play video games an if I could pack up shop and quit my day job to become a national superstar gamer I would.
Respect - This goes a bit hand in hand with maturity but without respect, both internally in a team and towards other players, you are not getting very far. Playing video games at a competitive level is just like any other job and in order to keep your team intact one has to show respect towards co-workers